Error when trying to copy a worksheet

I am using Microsoft Office 365 with Windows 10 - all updates done

Please see uploaded file. This is a sheet from a spreadsheet and i successfully copied worksheets every day in it (for about 7 days) until one day I got an error. I can get past the error and it does copy the worksheet but I can't see how to solve the problem. The earlier sheets on the spreadsheet do copy ok but not the later ones.

When you copy a worksheet you get a "local_mysql_date_format already exists error" - any help would be appreciated

The file is password protected spring21

After I tried Google I checked the Names Manager but there were only print areas there. It let me delete one but not the one remaining. It had no effect on the error.

Kind regards

Roy

You have hidden names in the book. Look at this for a solution: https://support.microsoft.com/en-us/...6-a11a2e148e7b

Hi GlennUK

That's superb. Thank you so much.

I'd never encountered the Document Inspector before nor had I realised there could be hidden names.

Another skill to learn.

Much obliged

Roy

My pleasure