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FIX_WORKLETS_ERROR.md

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Fixed: Worklets Version Mismatch Error

Problem

You were getting this error:

WorkletsError: [Worklets] Mismatch between JavaScript part and native part of Worklets (0.7.2 vs 0.5.1)

This happened because:

  • Expo Go has a pre-built native module with Worklets 0.5.1
  • Your JavaScript code was trying to use Worklets 0.7.2 (from react-native-reanimated)
  • These versions don't match, causing a crash

Solution Applied ✅

I've replaced react-native-reanimated with React Native's built-in Animated API in all components:

  1. LessonCarousel.tsx - Progress bar animation now uses Animated.Value
  2. MobileSyllabus.tsx - Section expand/collapse uses simple state (no animation needed)
  3. BookmarkButton.tsx - Button animations use Animated.spring and Animated.sequence
  4. babel.config.js - Removed reanimated plugin

What Changed

Before (Reanimated - causes error):

import Animated, { useSharedValue, withSpring } from 'react-native-reanimated';
const progress = useSharedValue(0);
progress.value = withSpring(100);

After (React Native Animated - works with Expo Go):

import { Animated } from 'react-native';
const progress = useRef(new Animated.Value(0)).current;
Animated.spring(progress, { toValue: 100 }).start();

Next Steps

  1. Stop your current Metro bundler (Ctrl+C)

  2. Clear cache and restart:

    npx expo start --clear

  3. Reload your app on your phone (shake device → Reload, or press r in terminal)

  4. The error should be gone! 🎉

Benefits

✅ Works with Expo Go (no native build needed) ✅ No version mismatches ✅ Smooth animations still work ✅ All features intact (swipeable lessons, progress tracking, bookmarks, etc.)

Optional: If You Want to Use Reanimated Later

If you want to use react-native-reanimated in the future, you'll need to:

  1. Create a development build (not Expo Go)
  2. Run: npx expo install react-native-reanimated
  3. Rebuild the native app: npx expo run:android or npx expo run:ios

But for now, the built-in Animated API works perfectly! 🚀