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Failed to save target content: Object reference not set to an instance of an object. - Trados Studio 2019

I need urgent help. 

I have been reviewing five already translated files in Trados Studio 2019 and now I can open only two of them, as when trying to open the other three files, the following message appears: 

Failed to save target content: Object reference not set to an instance of an object.

 

I´ve tried to create a new project and use the SDL XLIFF documents, but the same message appears.

 

I really do not know how to solve it and I have no time to review the three translated files again.

 

I hope someone can help me. Thanks in advance.