Undeclared namespace prefix "app" (for attribute "actionViewClass") in android studio
Click 2 Start 1:12 2022-10-03 20:40 1 765 0 0

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Undeclared namespace prefix app in android studioUndeclared namespace prefix app (for attribute actionViewClass) in android studioUndeclared namespace prefix app in androidUndeclared namespace prefix app unexpected namespace prefix in androidUnexpected namespace prefixandroid undeclared namespace prefix app in android studioandroid unexpected namespace prefix app in android studioUnexpected namespace prefix app errornamespace error in android studio