Failed to save target content: Sequence contains no elements

Hello,

I'm trying to save my target xlf file and am getting the error message "Failed to save target content: Sequence contains no elements". From looking around it seems like this is a problem with an empty comment but I've been through the document visually and can't find any sort of problem comment. Does anyone know what else the problem could come from please? And if not basically what I can do to sort it out now? Thanks for any help, Anna

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