feat (docs): add streamText troubleshooting page (#4730)

content/docs/09-troubleshooting/15-stream-text-not-working.mdx

@@ -0,0 +1,32 @@
+---
+title: streamText fails silently
+description: Troubleshooting errors related to the streamText function not working.
+---
+
+# `streamText` is not working
+
+## Issue
+
+I am using [`streamText`](/docs/reference/ai-sdk-core/stream-text) function, and it does not work.
+It does not throw any errors and the stream is only containing error parts.
+
+## Background
+
+`streamText` immediately starts streaming to enable sending data without waiting for the model.
+Errors become part of the stream and are not thrown to prevent e.g. servers from crashing.
+
+## Solution
+
+To log errors, you can provide an `onError` callback that is triggered when an error occurs.
+
+```tsx highlight="6-8"
+import { streamText } from 'ai';
+
+const result = streamText({
+  model: yourModel,
+  prompt: 'Invent a new holiday and describe its traditions.',
+  onError({ error }) {
+    console.error(error); // your error logging logic here
+  },
+});
+```