This error is due to certain symbols in the headline that are incorrectly formatted after saving.
Example, if there is a registered trademark ® in the ad, you will need to save the bulk sheet as Unicode Text in order to avoid Excel from changing the symbol to a �.
How To Fix The Issue
- From the Creatives tab, filter under the Headline for Contains "�."
- Download the report and open in Excel.
- Make the appropriate changes using Find/Replace.
- Save as Unicode Text and re-upload into the platform.