"File to save target content. Blank sheet names are not allowed" Urgent Help!!

Hello,

I am working on a project with 3 Excel files (Excel 2013). I translated them all and saved as target two of them without problems. But when I am trying to save the last one I get this message "Failed to save target content. Blank sheet names are not allowed". I went to option and I disabled the translation of sheet names in all versions of Excel, but nothing, I keep on getting this error!

Anyone can help me please??

Thanks <3!!!!!

Luisa