diff --git a/crawler/frontend/package-lock.json b/crawler/frontend/package-lock.json
index 66afda9..68a156c 100644
--- a/crawler/frontend/package-lock.json
+++ b/crawler/frontend/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.0.0",
       "dependencies": {
         "@hookform/resolvers": "^5.1.1",
+        "@radix-ui/react-alert-dialog": "^1.1.14",
         "@radix-ui/react-dialog": "^1.1.14",
         "@radix-ui/react-hover-card": "^1.1.14",
         "@radix-ui/react-label": "^2.1.7",
@@ -913,6 +914,34 @@
       "integrity": "sha512-XnbHrrprsNqZKQhStrSwgRUQzoCI1glLzdw79xiZPoofhGICeZRSQ3dIxAKH1gb3OHfNf4d6f+vAv3kil2eggA==",
       "license": "MIT"
     },
+    "node_modules/@radix-ui/react-alert-dialog": {
+      "version": "1.1.14",
+      "resolved": "https://registry.npmjs.org/@radix-ui/react-alert-dialog/-/react-alert-dialog-1.1.14.tgz",
+      "integrity": "sha512-IOZfZ3nPvN6lXpJTBCunFQPRSvK8MDgSc1FB85xnIpUKOw9en0dJj8JmCAxV7BiZdtYlUpmrQjoTFkVYtdoWzQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@radix-ui/primitive": "1.1.2",
+        "@radix-ui/react-compose-refs": "1.1.2",
+        "@radix-ui/react-context": "1.1.2",
+        "@radix-ui/react-dialog": "1.1.14",
+        "@radix-ui/react-primitive": "2.1.3",
+        "@radix-ui/react-slot": "1.2.3"
+      },
+      "peerDependencies": {
+        "@types/react": "*",
+        "@types/react-dom": "*",
+        "react": "^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc",
+        "react-dom": "^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "@types/react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@radix-ui/react-arrow": {
       "version": "1.1.7",
       "resolved": "https://registry.npmjs.org/@radix-ui/react-arrow/-/react-arrow-1.1.7.tgz",
diff --git a/crawler/frontend/package.json b/crawler/frontend/package.json
index 552d48f..bf0764c 100644
--- a/crawler/frontend/package.json
+++ b/crawler/frontend/package.json
@@ -11,6 +11,7 @@
   },
   "dependencies": {
     "@hookform/resolvers": "^5.1.1",
+    "@radix-ui/react-alert-dialog": "^1.1.14",
     "@radix-ui/react-dialog": "^1.1.14",
     "@radix-ui/react-hover-card": "^1.1.14",
     "@radix-ui/react-label": "^2.1.7",
diff --git a/crawler/frontend/src/App.tsx b/crawler/frontend/src/App.tsx
index d87b9c4..75b65ff 100644
--- a/crawler/frontend/src/App.tsx
+++ b/crawler/frontend/src/App.tsx
@@ -4,6 +4,7 @@ import './App.css';
 import { AppSidebar } from './AppSidebar';
 import { getUser, handleCallback, logout } from './auth/authService';
 import ActiveQuery from './components/ActiveQuery';
+import AlertError from './components/AlertError';
 import LoginModal from './components/LoginModal';
 import { Map } from './components/Map';
 import { Parameters, type ParameterValues } from './components/Parameters';
@@ -12,10 +13,51 @@ import { Button } from './components/ui/button';
 import { Separator } from './components/ui/separator';
 import { SidebarInset, SidebarProvider, SidebarTrigger } from './components/ui/sidebar';
 
+const fetchData = async (user: User, baseQueyrUri: string, parameters: ParameterValues, method: string = 'GET') => {
+  const accessToken = user.access_token;
+  const queryString = new URLSearchParams();
+  queryString.append('listing_type', parameters.listing_type)
+  if (parameters.min_bedrooms) {
+    queryString.append('min_bedrooms', parameters.min_bedrooms.toString());
+  }
+  if (parameters.max_bedrooms) {
+    queryString.append('max_bedrooms', parameters.max_bedrooms.toString())
+  }
+  if (parameters.max_price) {
+    queryString.append("max_price", parameters.max_price.toString());
+  }
+  if (parameters.min_price) {
+    queryString.append("min_price", parameters.min_price.toString());
+  }
+  if (parameters.min_sqm) {
+    queryString.append("min_sqm", parameters.min_sqm.toString());
+  }
+
+  const response = await fetch(baseQueyrUri + '?' + queryString,
+    {
+      method: method,
+      headers: {
+        'Authorization': `Bearer ${accessToken}`, // Pass the token
+        'Content-Type': 'application/json',
+      },
+    }
+  );
+  if (!response.ok) {
+    throw new Error('Error: ' + response.status);
+  }
+  const data: Response = await response.json();
+  return data;
+};
+
+
 function App() {
   const [listingData, setListingData] = useState({});
   const [taskID, setTaskID] = useState<string | null>(null);
   const [user, setUser] = useState<User | null>(null);
+  const [isParametersModalOpen, setIsParametersModalOpen] = useState(true);
+  const [queryParameters, setQueryParameters] = useState<ParameterValues | null>(null);
+  const [submitError, setSubmitError] = useState<string | null>(null);
+  const [alertDialogIsOpen, setAlertDialogIsOpen] = useState(false);
 
   useEffect(() => {
     // Check if this is a callback from Authentik (after login)
@@ -30,68 +72,40 @@ function App() {
     getUser().then(setUser);
   }, []);
 
-  const [isParametersModalOpen, setIsParametersModalOpen] = useState(true)
-  const [queryParameters, setQueryParameters] = useState<ParameterValues | null>(null)
-  const fetchData = async (baseQueyrUri: string, parameters: ParameterValues, method: string = 'GET') => {
-    const accessToken = user?.access_token;
-    const queryString = new URLSearchParams();
-    queryString.append('listing_type', parameters.listing_type)
-    if (parameters.min_bedrooms) {
-      queryString.append('min_bedrooms', parameters.min_bedrooms.toString());
-    }
-    if (parameters.max_bedrooms) {
-      queryString.append('max_bedrooms', parameters.max_bedrooms.toString())
-    }
-    if (parameters.max_price) {
-      queryString.append("max_price", parameters.max_price.toString());
-    }
-    if (parameters.min_price) {
-      queryString.append("min_price", parameters.min_price.toString());
-    }
-    if (parameters.min_sqm) {
-      queryString.append("min_sqm", parameters.min_sqm.toString());
-    }
+  if (!user) {
+    return <LoginModal isOpen={user === null} />
+  }
 
-    const response = await fetch(baseQueyrUri + '?' + queryString,
-      {
-        method: method,
-        headers: {
-          'Authorization': `Bearer ${accessToken}`, // Pass the token
-          'Content-Type': 'application/json',
-        },
-      }
-    );
-    if (!response.ok) {
-      throw new Error('Error: ' + response.status);
-    }
-    const data: Response = await response.json();
-    return data;
-  };
   const onSubmit = async (action: 'fetch-data' | 'visualize', parameters: ParameterValues) => {
     // Fetch listing data
     setQueryParameters(parameters)
     setIsParametersModalOpen(false)
     let data = null;
     if (action === 'visualize') {
-      data = await fetchData("/api/listing_geojson", parameters);
+      try {
+        data = await fetchData(user, "/api/listing_geojson", parameters);
+      } catch (error) {
+        setSubmitError(error.message)
+        setAlertDialogIsOpen(true)
+      }
       if (data) {
         setListingData(data);
       }
     } else if (action === 'fetch-data') {
-      data = await fetchData("/api/refresh_listings", parameters, 'POST');
+      try {
+        data = await fetchData(user, "/api/refresh_listings", parameters, 'POST');
+      } catch (error) {
+        setSubmitError(error.message)
+        setAlertDialogIsOpen(true)
+      }
       if (data) {
         // @ts-expect-error
         setTaskID(data.task_id)
       }
     }
     console.log(data)
-    setIsParametersModalOpen(false)
-
   }
 
-  if (!user) {
-    return <LoginModal isOpen={user === null} />
-  }
   return (
     <>
       <SidebarProvider defaultOpen={false}>
@@ -121,8 +135,9 @@ function App() {
             <div className="flex gap-2 p-2 bg-gray-100">
               <h1>Welcome, {user.profile.name}!</h1>
               <Button onClick={logout}>Logout</Button>
-              <Parameters onSubmit={onSubmit} isOpen={isParametersModalOpen} />
+              <Parameters onSubmit={onSubmit} isOpen={isParametersModalOpen} setIsOpen={setIsParametersModalOpen} />
               <ActiveQuery taskID={taskID} />
+              <AlertError message={submitError} open={alertDialogIsOpen} setIsOpen={setAlertDialogIsOpen} />
             </div>
             {Object.keys(listingData).length > 0 &&
               <div className="flex-1 w-full relative" style={{ minHeight: 0, marginBottom: '8rem' }}>
diff --git a/crawler/frontend/src/components/ActiveQuery.tsx b/crawler/frontend/src/components/ActiveQuery.tsx
index e91a760..9830ecf 100644
--- a/crawler/frontend/src/components/ActiveQuery.tsx
+++ b/crawler/frontend/src/components/ActiveQuery.tsx
@@ -1,6 +1,7 @@
 import { getUser } from '@/auth/authService';
 import type { User } from 'oidc-client-ts';
 import React, { useEffect, useState } from 'react';
+import AlertError from './AlertError';
 import { HoverCard, HoverCardContent, HoverCardTrigger } from './ui/hover-card';
 import { Progress } from './ui/progress';
 
@@ -17,7 +18,6 @@ const fetchTaskStatus = async (user: User, taskID: string) => {
             'Content-Type': 'application/json',
         },
     });
-
     if (!response.ok) {
         throw new Error(`Failed to fetch task status: ${response.status}`);
     }
@@ -73,6 +73,8 @@ const ActiveQuery: React.FC<ModalProps> = ({
     const [progressPercentage, setProgressPercentage] = useState<number>(0);
     const [taskStatus, setTaskStatus] = useState<TaskStatus | null>(TaskStatus.QUEUED);
     const [lastUpdateTime, setLastUpdateTime] = useState<Date>(new Date());
+    const [fetchStatusError, setFetchStatusError] = useState<string | null>(null);
+    const [alertDialogIsOpen, setAlertDialogIsOpen] = useState(false);
 
     // fetch status periodically
     // maybe move to ws one day
@@ -88,7 +90,12 @@ const ActiveQuery: React.FC<ModalProps> = ({
                 } catch (error: any) {
                     clearInterval(interval);
                     setTaskStatus(TaskStatus.FAILED)
-                    alert(error)
+                    setAlertDialogIsOpen(true)
+                    if (error instanceof Error) {
+                        setFetchStatusError(error.message)
+                    } else {
+                        setFetchStatusError('Failed to update task status: ' + error.toString())
+                    }
                 }
                 if (!data) {
                     clearInterval(interval);
@@ -120,7 +127,7 @@ const ActiveQuery: React.FC<ModalProps> = ({
             <div>
                 <HoverCard>
                     <HoverCardTrigger>
-                        {taskStatus && <p>Task status: {taskStatus} </p>}
+                        {taskStatus && <>Task status: {taskStatus} </>}
                         <Progress value={progressPercentage} />
                     </HoverCardTrigger>
                     <HoverCardContent>
@@ -130,7 +137,7 @@ const ActiveQuery: React.FC<ModalProps> = ({
                     </HoverCardContent>
                 </HoverCard>
             </div>
-
+            <AlertError message={fetchStatusError} open={alertDialogIsOpen} setIsOpen={setAlertDialogIsOpen} />
         </>
     )
 };
diff --git a/crawler/frontend/src/components/AlertError.tsx b/crawler/frontend/src/components/AlertError.tsx
new file mode 100644
index 0000000..e771b0e
--- /dev/null
+++ b/crawler/frontend/src/components/AlertError.tsx
@@ -0,0 +1,26 @@
+import { AlertDialog, AlertDialogAction, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle } from "./ui/alert-dialog";
+
+export default function AlertError(
+    props: {
+        message: string | null;
+        open: boolean;
+        setIsOpen: (isOpen: boolean) => void;
+    }
+) {
+    return (
+        <AlertDialog open={props.open} onOpenChange={props.setIsOpen}>
+            {/* <AlertDialogTrigger>Open</AlertDialogTrigger> */}
+            <AlertDialogContent>
+                <AlertDialogHeader>
+                    <AlertDialogTitle>Error</AlertDialogTitle>
+                    <AlertDialogDescription>
+                        {props.message}
+                    </AlertDialogDescription>
+                </AlertDialogHeader>
+                <AlertDialogFooter>
+                    <AlertDialogAction onClick={() => props.setIsOpen(false)}>Close</AlertDialogAction>
+                </AlertDialogFooter>
+            </AlertDialogContent>
+        </AlertDialog>
+    )
+}
diff --git a/crawler/frontend/src/components/Parameters.tsx b/crawler/frontend/src/components/Parameters.tsx
index e379274..26ea8ec 100644
--- a/crawler/frontend/src/components/Parameters.tsx
+++ b/crawler/frontend/src/components/Parameters.tsx
@@ -36,6 +36,7 @@ export function Parameters(
     props: {
         isOpen: boolean,
         onSubmit: (action: 'fetch-data' | 'visualize', fromValues: ParameterValues) => void,
+        setIsOpen: (isOpen: boolean) => void
     }
 ) {
     const {
@@ -76,10 +77,10 @@ export function Parameters(
 
 
     return <>
-        {/* <Dialog open={props.isOpen} > */}
-        <Dialog >
+        <Dialog open={props.isOpen} onOpenChange={props.setIsOpen} >
+            {/* <Dialog > */}
             <DialogTrigger asChild>
-                <Button variant="outline">Open Parameters</Button>
+                <Button variant="outline" onClick={() => props.setIsOpen(true)}>Open Parameters</Button>
             </DialogTrigger>
             <DialogContent className="sm:max-w-[425px]">
                 <DialogTitle>
diff --git a/crawler/frontend/src/components/ui/alert-dialog.tsx b/crawler/frontend/src/components/ui/alert-dialog.tsx
new file mode 100644
index 0000000..935eecf
--- /dev/null
+++ b/crawler/frontend/src/components/ui/alert-dialog.tsx
@@ -0,0 +1,155 @@
+import * as React from "react"
+import * as AlertDialogPrimitive from "@radix-ui/react-alert-dialog"
+
+import { cn } from "@/lib/utils"
+import { buttonVariants } from "@/components/ui/button"
+
+function AlertDialog({
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Root>) {
+  return <AlertDialogPrimitive.Root data-slot="alert-dialog" {...props} />
+}
+
+function AlertDialogTrigger({
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Trigger>) {
+  return (
+    <AlertDialogPrimitive.Trigger data-slot="alert-dialog-trigger" {...props} />
+  )
+}
+
+function AlertDialogPortal({
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Portal>) {
+  return (
+    <AlertDialogPrimitive.Portal data-slot="alert-dialog-portal" {...props} />
+  )
+}
+
+function AlertDialogOverlay({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Overlay>) {
+  return (
+    <AlertDialogPrimitive.Overlay
+      data-slot="alert-dialog-overlay"
+      className={cn(
+        "data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 fixed inset-0 z-50 bg-black/50",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogContent({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Content>) {
+  return (
+    <AlertDialogPortal>
+      <AlertDialogOverlay />
+      <AlertDialogPrimitive.Content
+        data-slot="alert-dialog-content"
+        className={cn(
+          "bg-background data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 fixed top-[50%] left-[50%] z-50 grid w-full max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%] gap-4 rounded-lg border p-6 shadow-lg duration-200 sm:max-w-lg",
+          className
+        )}
+        {...props}
+      />
+    </AlertDialogPortal>
+  )
+}
+
+function AlertDialogHeader({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-dialog-header"
+      className={cn("flex flex-col gap-2 text-center sm:text-left", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogFooter({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-dialog-footer"
+      className={cn(
+        "flex flex-col-reverse gap-2 sm:flex-row sm:justify-end",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogTitle({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Title>) {
+  return (
+    <AlertDialogPrimitive.Title
+      data-slot="alert-dialog-title"
+      className={cn("text-lg font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogDescription({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Description>) {
+  return (
+    <AlertDialogPrimitive.Description
+      data-slot="alert-dialog-description"
+      className={cn("text-muted-foreground text-sm", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogAction({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Action>) {
+  return (
+    <AlertDialogPrimitive.Action
+      className={cn(buttonVariants(), className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogCancel({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Cancel>) {
+  return (
+    <AlertDialogPrimitive.Cancel
+      className={cn(buttonVariants({ variant: "outline" }), className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  AlertDialog,
+  AlertDialogPortal,
+  AlertDialogOverlay,
+  AlertDialogTrigger,
+  AlertDialogContent,
+  AlertDialogHeader,
+  AlertDialogFooter,
+  AlertDialogTitle,
+  AlertDialogDescription,
+  AlertDialogAction,
+  AlertDialogCancel,
+}
diff --git a/crawler/frontend/src/components/ui/alert.tsx b/crawler/frontend/src/components/ui/alert.tsx
new file mode 100644
index 0000000..1421354
--- /dev/null
+++ b/crawler/frontend/src/components/ui/alert.tsx
@@ -0,0 +1,66 @@
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@/lib/utils"
+
+const alertVariants = cva(
+  "relative w-full rounded-lg border px-4 py-3 text-sm grid has-[>svg]:grid-cols-[calc(var(--spacing)*4)_1fr] grid-cols-[0_1fr] has-[>svg]:gap-x-3 gap-y-0.5 items-start [&>svg]:size-4 [&>svg]:translate-y-0.5 [&>svg]:text-current",
+  {
+    variants: {
+      variant: {
+        default: "bg-card text-card-foreground",
+        destructive:
+          "text-destructive bg-card [&>svg]:text-current *:data-[slot=alert-description]:text-destructive/90",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function Alert({
+  className,
+  variant,
+  ...props
+}: React.ComponentProps<"div"> & VariantProps<typeof alertVariants>) {
+  return (
+    <div
+      data-slot="alert"
+      role="alert"
+      className={cn(alertVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+function AlertTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-title"
+      className={cn(
+        "col-start-2 line-clamp-1 min-h-4 font-medium tracking-tight",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AlertDescription({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-description"
+      className={cn(
+        "text-muted-foreground col-start-2 grid justify-items-start gap-1 text-sm [&_p]:leading-relaxed",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Alert, AlertTitle, AlertDescription }