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  1. ,
    Expert tip

    Check if android.permission.WRITE_EXTERNAL_STORAGE is in AndroidManifest.xml. Also, add checks in your code to see if the storage is available to write before trying to write. And last: create a folder to put your files inside.

libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)	at libcore.io.Posix.open(Native Method)	at libcore.io.BlockGuardOs.open(BlockGuardOs.java:98)	at libcore.io.IoBridge.open(IoBridge.java:390)	at java.io.FileInputStream.(FileInputStream.java:78)	at java.io.FileReader.(FileReader.java:42)	at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:272)	at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1271)	at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:810)	at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:721)	at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:699)	at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)	at com.android.server.net.NetworkStatsService$1.onReceive(NetworkStatsService.java:589)	at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728)	at android.os.Handler.handleCallback(Handler.java:605)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.os.HandlerThread.run(HandlerThread.java:60)