React Native internal error

Question

I have been trying to make a simple test app using react native but I am getting this

Sometimes the app runs without any error but again after sometime this error pops up so cam someone please help me. Thank You!!

This is my console output:

image

And this is what I am getting in android studio logcat:

12-04 18:19:42.856 4147-4163/com.album E/unknown:ReactNative: Unable to download JS bundle
                                                          com.facebook.react.common.DebugServerException: The development server returned response error code: 500

                                                          URL: http://10.0.2.2:8081/index.bundle?platform=android&dev=true&minify=false

                                                          Body:
                                                          {"type":"InternalError","errors":[],"message":"Metro Bundler has encountered an internal error, please check your terminal error output for more details"}
                                                              at com.facebook.react.devsupport.BundleDownloader.processBundleResult(BundleDownloader.java:225)
                                                              at com.facebook.react.devsupport.BundleDownloader.access$100(BundleDownloader.java:40)
                                                              at com.facebook.react.devsupport.BundleDownloader$1.onResponse(BundleDownloader.java:192)
                                                              at okhttp3.RealCall$AsyncCall.execute(RealCall.java:135)
                                                              at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
                                                              at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                                                              at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                              at java.lang.Thread.run(Thread.java:818)
12-04 18:19:42.899 4147-4164/com.album E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb407eec0
12-04 18:19:42.902 4147-4147/com.album E/unknown:ReactNative: Exception in native call
                                                          com.facebook.react.common.DebugServerException: The development server returned response error code: 500

                                                          URL: http://10.0.2.2:8081/index.bundle?platform=android&dev=true&minify=false

                                                          Body:
                                                          {"type":"InternalError","errors":[],"message":"Metro Bundler has encountered an internal error, please check your terminal error output for more details"}
                                                              at com.facebook.react.devsupport.BundleDownloader.processBundleResult(BundleDownloader.java:225)
                                                              at com.facebook.react.devsupport.BundleDownloader.access$100(BundleDownloader.java:40)
                                                              at com.facebook.react.devsupport.BundleDownloader$1.onResponse(BundleDownloader.java:192)
                                                              at okhttp3.RealCall$AsyncCall.execute(RealCall.java:135)
                                                              at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
                                                              at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                                                              at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                              at java.lang.Thread.run(Thread.java:818)

Answer 1

I restarted my laptop and it worked for me.

I am not saying this is the correct solution but it worked for me.

Answer 2

Sometimes this error can occur because the application cache needs to be cleaned.

You could try to get into the Android folder in the react-native project directory and run this command:gradlew clean then go back to react-native root folder and try to run android emulator react-native run-android. Also you could try react-native start --reset-cache.

Answer 3

Just try this line of code in your terminal

1. sudo lsof -i :8081
2. kill -9

Answer 4

Try this

1.sudo lsof -i :<Your port>
2.Run sudo kill -9 <PID>
3.Run application again