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Generate Target Files: Error (Powerpoint files)

Dear all,

I am having quite an issue generating target files for my project, this error keeps popping up, only when it comes to .ppt files:

"Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index."

I tried checking and correcting the tags, but the problem keeps persisting. I understand that the files must have been corrupted since the creation of the project package that was sent to the translator?

Could I have some help with this please? It is a big project and I am not able to copy-paste all the target translations in order to deliver to the client.