An element with the same key has already been added

Hi! Such a message started appearing during translation a couple of days ago. When it emerges, my work stops - no changes can be made. Thanks goodness I still have 2011 version where I can continue my work. Surprisingly, when I reopen my project in 2017 it becomes translatable again; however, sooner or later the error reappears again and again. Any suggestions? TIA

   

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