diff --git a/.changeset/grumpy-goats-refuse.md b/.changeset/grumpy-goats-refuse.md
new file mode 100644
index 0000000000..8dc2e390fc
--- /dev/null
+++ b/.changeset/grumpy-goats-refuse.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder': patch
+---
+
+Show error on task page if task does not exist.
diff --git a/plugins/scaffolder/package.json b/plugins/scaffolder/package.json
index f2f69c029b..9cf7c01d02 100644
--- a/plugins/scaffolder/package.json
+++ b/plugins/scaffolder/package.json
@@ -33,6 +33,7 @@
     "@backstage/catalog-client": "^0.3.11",
     "@backstage/catalog-model": "^0.7.8",
     "@backstage/config": "^0.1.5",
+    "@backstage/errors": "^0.1.1",
     "@backstage/core": "^0.7.8",
     "@backstage/integration": "^0.5.2",
     "@backstage/integration-react": "^0.1.1",
diff --git a/plugins/scaffolder/src/api.ts b/plugins/scaffolder/src/api.ts
index 0c5eb2b268..c7b1594071 100644
--- a/plugins/scaffolder/src/api.ts
+++ b/plugins/scaffolder/src/api.ts
@@ -22,6 +22,7 @@ import {
   IdentityApi,
   Observable,
 } from '@backstage/core';
+import { ResponseError } from '@backstage/errors';
 import { ScmIntegrationRegistry } from '@backstage/integration';
 import ObservableImpl from 'zen-observable';
 import { ListActionsResponse, ScaffolderTask, Status } from './types';
@@ -128,9 +129,7 @@ export class ScaffolderClient implements ScaffolderApi {
     });
 
     if (!response.ok) {
-      throw new Error(
-        `Failed to fetch template parameter schema, ${await response.text()}`,
-      );
+      throw ResponseError.fromResponse(response);
     }
 
     const schema: TemplateParameterSchema = await response.json();
@@ -173,9 +172,15 @@ export class ScaffolderClient implements ScaffolderApi {
     const token = await this.identityApi.getIdToken();
     const baseUrl = await this.discoveryApi.getBaseUrl('scaffolder');
     const url = `${baseUrl}/v2/tasks/${encodeURIComponent(taskId)}`;
-    return fetch(url, {
+    const response = await fetch(url, {
       headers: token ? { Authorization: `Bearer ${token}` } : {},
-    }).then(x => x.json());
+    });
+
+    if (!response.ok) {
+      throw ResponseError.fromResponse(response);
+    }
+
+    return await response.json();
   }
 
   streamLogs({
@@ -234,6 +239,11 @@ export class ScaffolderClient implements ScaffolderApi {
   async listActions(): Promise<ListActionsResponse> {
     const baseUrl = await this.discoveryApi.getBaseUrl('scaffolder');
     const response = await fetch(`${baseUrl}/v2/actions`);
+
+    if (!response.ok) {
+      throw ResponseError.fromResponse(response);
+    }
+
     return await response.json();
   }
 }