java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams

private void MoveBTN() {
//transition
TransitionManager.beginDelayedTransition(myLayout);
// View myBtn=findViewById(R.id.btn1);
//moveing button
RelativeLayout.LayoutParams LP=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT);
LP.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM,RelativeLayout.TRUE);
LP.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,RelativeLayout.TRUE);
myButton1.setLayoutParams(LP);
//resizing button
ViewGroup.LayoutParams size=myButton1.getLayoutParams();
size.height=71;
size.width=65;
myButton1.setLayoutParams(size);
}