i solved this issue by myself. issue occurs when i duplicated the axml file in layout folder (i had backup since i have big revision on axml file). after several changes on axml file, i try to rebuild and the error shows. find a solution and tried what solution says here but got no luck. i realized that xamarin generate resource file that contains IDs. and i try ko exclude that duplicated axml and try to rebuild and it works. hope this will help others.
NOTE: make sure "android:id" value in the whole project are all unique.
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