Can't use Mannequin Tag Definitions Editor (It throws errors)

I have this weird problem with the tag editor in mannequin that prevents me from using it. When I open a tag file, it opens a message box with the title "SandboxNAB" and it says "Encountered an improper argument.". I can't add any new tags. And when I create a new tag file, it throws the same error and does not save the file.
I've tried running the editor (sandbox) as admin and no luck! I've had this problem since CryEngine 5.0 and it still exits!
What's wrong?

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