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Error java.lang.ClassCastException: Bootstrap method returned null

echiuechiu
in Android

Hi i have a big problem, what i cant solve :confused:
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 32581
java.lang.BootstrapMethodError: Exception from call site #1 bootstrap method
at com.mbientlab.metawear.android.BtleService$AndroidPlatform.connectAsync(BtleService.java:475)
at com.mbientlab.metawear.impl.JseMetaWearBoard.connectAsync(JseMetaWearBoard.java:752)
at com.example.myapplication.MainActivity.retrieveBoard(MainActivity.java:61)
at com.example.myapplication.MainActivity.onServiceConnected(MainActivity.java:43)
at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1848)
at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1880)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7091)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:975)
Caused by: java.lang.ClassCastException: Bootstrap method returned null

I followed every step of tutorial

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