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Creating a SDL Package

I have finished translation on two documents that are part of a package. I want to create a return package, but I keep receiving two error messages when I try to create the package. I am using Trados Studio 2017 on a Mac (using Parallels). I don't understand what could be the issue? I am very concerned.

 

Error Message: When I try to press "Finish" I get the error message: "The process cannot access the files because they are being used by another process". I hit "OK" and then I get the error message: "Object reference not set to an instance of an object"