URGENT: MultiTerm unable to save entries

After I have written an entry in the termbase, an error message appears: "At least one error has occurred" in red at the bottom of the screen. After that, I can no longer access any other terms.
I have already updated the programme, but I can't remember what the update was called. I am using MultiTerm 2021 in German and the error message described above already appeared before the update.

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