Hmm, sorry, I wouldn’t know what that error means, in my project I actually don’t do nothing in level blueprint, I handle most of game play stuff and environment from GameModeBlueprint (extended from C++ GameMode Class).
I searched docs, hope this helps :
https://docs.unrealengine.com/latest/INT/API/Editor/BlueprintGraph/FMemberReference/index.html
Returns member UProperty/UFunction
this reference is pointing to, or NULL
if it no longer exists Derives ‘self’
scope from supplied Blueprint node if
required Will check for redirects and
fix itself up if one is found.
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