java.lang.RuntimeException: Unable to start activity ComponentInfo{Ninja.coder.Ghostemane.code/Ninja.coder.Ghostemane.code.FiledirActivity}: java.lang.IllegalStateException: TypeToken must be created with a type argument: new TypeToken<...>() {}; When using code shrinkers (ProGuard, R8, ...) make sure that generic signatures are preserved. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3846) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4022) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2336) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:246) at android.app.ActivityThread.main(ActivityThread.java:8653) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130) Caused by: java.lang.IllegalStateException: TypeToken must be created with a type argument: new TypeToken<...>() {}; When using code shrinkers (ProGuard, R8, ...) make sure that generic signatures are preserved. at com.google.gson.reflect.TypeToken.getTypeTokenTypeArgument(TypeToken.java:95) at com.google.gson.reflect.TypeToken.(TypeToken.java:65) at Ninja.coder.Ghostemane.code.cz.(Unknown Source:2) at Ninja.coder.Ghostemane.code.FiledirActivity.c(Unknown Source:37) at Ninja.coder.Ghostemane.code.FiledirActivity.e(Unknown Source:447) at Ninja.coder.Ghostemane.code.FiledirActivity.onCreate(Unknown Source:30) at android.app.Activity.performCreate(Activity.java:8207) at android.app.Activity.performCreate(Activity.java:8191) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3819) ... 11 more