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Inspectioin error

I have seen from youtube a video about inspecting, I made it - it works. Every time i try to pick up something other than the blueprints for inspection - error : K2Node_DynamicCast_AsMasterBlueprint from function “Execute Ubergraph_FirstPersonCharacter” from node : “SetActorsLocationandRotation” in graph “CollapseGraph_1” Accessed None trying to read property “K2Node_DynamicCast_AsMasterBlueprint”.
I have made a child blueprint for the objects I want to inspect, I think this is somehow the problem. (btw I am using static mesh)
The video for more details :
Part 1 : https://www.youtube.com/watch?v=I7WW7uzdeiA&t=409s
Part 2 : https://www.youtube.com/watch?v=JdC7T6I7WG0&t=59s

Thank you for your time !

Buuump! Anyone please?