Maria Guimaraes It's always helpful to provide the error stack as an "object reference error" doesn't really provide any information we can use to find an obvious resolution to the problem. This article might be interesting for you - multifarious.filkin.com/.../ In the meantime we will be pleased to help you with this problem so have logged a support case on your behalf. We do prioritise customers who have a support contract so please keep in mind it could take up to 48 hours, especially over a weekend, but rest assured we will contact you as soon as we can. You will be contacted at the email address used for this Community. Support Case Id : 00781272 .

Hello, Paul. Thank you so much for your reply and actions. I continue having the same issues, so I do hope someone will come to rescue soon enough. Even after this project.

I'm having this same problem, and this is preventing me from finishing my work.

I downloaded the stack trace and asked chatGPT for help with the error (as suggested by the article). Here is the answer (summary):

In summary, the stack trace shows that a NullReferenceException occurred in the Sdl.Verification.TermVerifier namespace, specifically in the method HasTargetEntry. This exception happened at the top of the call hierarchy. To debug and fix this issue, you would need to inspect the code for that method and check where an object reference is not properly initialized before being used.

What do I need to do? Must I Disable term verification for this file?

I disabled all term bases and could confirm the segments with problem. But this is not a solution, since I expect to be able to use term viewer during my translations. So, if you have another solution, I'd appreciate. 
Thank you

I disabled all term bases and could confirm the segments with problem. But this is not a solution, since I expect to be able to use term viewer during my translations. So, if you have another solution, I'd appreciate. 
Thank you