UMG Unable to Create Template For Widget

er i assumed you were on the same tutorial as me, sorry.

https://docs.unrealengine.com/latest/INT/Videos/PLZlv_N0_O1gZalvQWYs8sc7RP_-8eSr3i/9-h2lQLs8Tk/index.html

produces the error during the tutorial at 23:00 (4.8 i think) if that helps any, by copy/pasting user created widgets and I solved by dragging individually from palette instead.