Trados 2022 error message : "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"?

I have an issue that Trados 2022 won't open.

I get the error message : "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index".

I tried a reinstall - didn't change anything.

Can someone please assist?

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