Xperai AO1 android 8.1

[JMastaC]

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cyb3rko.pincredible/com.cyb3rko.pincredible.MainActivity}: ir: Unable to instantiate fragment y50: could not find Fragment constructor
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2896)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2974)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4926)
at android.app.ActivityThread.-wrap18(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1669)
at android.os.Handler.dispatchMessage(Handler.java:108)
at android.os.Looper.loop(Looper.java:206)
at android.app.ActivityThread.main(ActivityThread.java:6749)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:845)
Caused by: ir: Unable to instantiate fragment y50: could not find Fragment constructor
at yr.a(SourceFile:59)
at rs.a(SourceFile:3)
at androidx.fragment.app.a.(SourceFile:13)
at fs.X(SourceFile:258)
at fs.b(SourceFile:168)
at cf.a(SourceFile:156)
at androidx.activity.a.onCreate(SourceFile:31)
at nr.onCreate(SourceFile:1)
at r9.onCreate(SourceFile:10)
at com.cyb3rko.pincredible.MainActivity.onCreate(SourceFile:1)
at android.app.Activity.performCreate(Activity.java:6985)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2849)
... 10 more
Caused by: java.lang.NoSuchMethodException: []
at java.lang.Class.getConstructor0(Class.java:2320)
at java.lang.Class.getConstructor(Class.java:1725)
at yr.a(SourceFile:24)
... 22 more