Blueprint comunication, variables doesnt work

The variables in the blueprints apear with “failed to find variable property” i followed the instruccion of the unreal channel tutorial of drag and drop → Drag & Drop with UMG | 01 | Live Training | Unreal Engine - YouTube how do I fix the variables? i´m very new to this.
thank you

You sure “Drag Item” has correct Class and Casting not failed?