I’m frustrated

What does pop up "account ist ein erforderlicher Wert" (account is a required value ?!) mean?

Suddenly every few seconds there is a pop up window: "account ist ein erforderlicher Wert" Translation would be "account is a required value". I don't know what I have to do to fix this, i didn't find it in "help". If I try to close Squirrel, there is a warning that all my changes can't be saved until i fix the problem! Please help.
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