SDL Trados Studio 2019 SR2: 'Error: TranslationProviderThrewException'.

SDL Trados Studio 2019 SR2: when trying to finalize a translation, Studio gets stuck on updating main translation memories: 'Error: TranslationProviderThrewException'. It is also not possible to generate a target file: 'Error: Object reference not set to an instance of an object'.  I have already upgraded the TM, but this hasn't solved it. Can anyone help? Thanks in advance.

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