How can I solve the following error?

Everytime that I try to debug on my android device with 8.0 S.O, it has activated the developer option,etc etc.
I have 35 files with the following error :

"Could not load file or assembly 'netstandard, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified."


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