Accessed None "MyCharacter" from node For EachLoop

Dears
Hi
I have issue with Menu list that content Documents, notes, Maps etc.
I picked up item ( Document ) for example.
Then when i pressed (M) Keyboard it will show me menu list, this step okay.

After that when i clicked document button it will show me Document list, i mean new document list widget.
It will not show me the name of document in document list

I don’t know where is problem , here my blueprints

My Character Blueprint

Document Widget Blueprint

Error

43917-1.jpg

Help me to achieve this

Thanks

Remainder!!