FlutterFlow Unknown Error Compiling Custom Code

How to fix it

Try these in order — the most common fix is first.

1. 1. Match names

   1. Make the function or class name identical to the name in the editor
   Did this fix it? Yes No

2. 2. Check imports and dependencies

   Copy steps
   1. Remove unused imports
   2. Add needed packages in Pubspec Dependencies
   Did this fix it? Yes No

3. 3. Isolate the cause

   Copy steps
   1. Disable custom authentication temporarily if enabled
   2. Rename the action and compile again
   Did this fix it? Yes No

Symptoms

Saving or compiling a custom widget or action shows Unknown error compiling custom code.

Why it happens

• Code name differs from the name in the editor
• Invalid imports or missing dependencies
• Conflict with custom authentication reported by one user

This guide also covers

• flutterflow unknown error compiling custom code
• flutterflow custom widget error

The same problem in other apps

All not loading, error messages & connection guides →

• Bubble Workload Units Running Out Too Fast (Bubble)
• Firebase auth/invalid-api-key Error (Firebase)

Other FlutterFlow errors

• FlutterFlow Build Failed
• FlutterFlow Test Mode Not Loading
• FlutterFlow Firebase Connection and Permission Denied Error
• FlutterFlow Code Export Not Working
• FlutterFlow Version Solving Failed Package Conflict
• Why Is FlutterFlow So Slow
• FlutterFlow Firestore Permission Error in Run Mode
• FlutterFlow App Store and Google Play Release Errors