Itgenuty361 on saving - "could not store the repository in the Excel Workbook"

Questions
1

When saving a workbook I have created I am getting this message:

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itgenuty361
The password you supplied is not correct.
Verify that the CAPS LOCK key is off and be sure to use the correct capitalization.
Make sure Excel is not in cell edit mode or calculating.

Can someone advise what the reason is for this?

2

According to the error message, the internal password use for protection of the workbook and/or worksheets in the repository (see button “Model Editor”) no longer matches the password registered on the workbook and/or worksheet.

Have any changes been made in the security of the Excel-workbook?