Trying to save a translation of a .xlf file and get the following error message: “Failed to save target content. Collection was modified; enumeration operation may not execute.”

Hi!

I am trying to save a translation of an XLF file, but I get the following error message:

“Failed to save target content. Collection was modified; enumeration operation may not execute.”

I already tried a previously posted advice to retranslate using the "translate single document"-option, but this does not help.  Same error msg.  

Can someone please advise?

Thanks in advance for your help.

With kind regards,

Esther Brandsma