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Object reference not set to an instance of an object when trying to make a package for external translation

I've just tried to create a package for external translation. When doing so I received the above mentioned error. I've openen the file again and the only error messages I saw had to do with a segment not beining translated. I tried to solve this by filling the empty segments with de source. I tried to make a new package and I got the same error message.

 

When preparing the translation I used the option 'based on previous translation'. Could that be the reason why I recieved this error message? I prepared a file and later in the project the timeline was tightened so I had to split the original file but wanted to use the prepared information.

 

Paul or anyone else do you have a solution/suggestion to fix this problem? I'm on a tight deadline.