Any help? I tried to search on google and stackoverflow but noone had this issue...
And i already tried this https://social.msdn.microsoft.com/Forums/vstudio/en-US/e1eb41c4-a43d-40e6-9228-129f0afcfbb2/element-name-is-not-supported-in-a-windows-presentation-foundation-wpf-project?forum=wpf