Failed to save target: A table column can not be empty

Hi,

I'm translating a Powerpoint and have a "Failed to save target: A table column can not be empty" message. I tested the save to target  on a few slides a few days ago, because I have 132 slides and they comprise embedded pie charts from Excel data, and it worked perfectly. However, now I've translated the entire document I can't save the target and get this error message: Failed to save target: A table column can not be empty."

I've checked the previous posts on that topic but unfortunately that doesn't help me. Can anyone please help?

Kind regards,

Hélène