java.lang.IllegalStateException: Could not find a method backBtn(View) in the activity class com.extodigital.extochat.RegisterScreen for onClick handler on view class android.widget.Button with id 'button'

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java.lang.IllegalStateException: Could not find a method backBtn(View) in the activity class com.extodigital.extochat.RegisterScreen for onClick handler on view class android.widget.Button with id 'button'
at java.lang.Class.getMethod(Class.java:664)
at java.lang.Class.getMethod(Class.java:643)
at android.view.View$1.onClick(View.java:3987)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)

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