Error in Working with Mailing Function

See whether can be fixed by the following:

1.    Check the Excel file format
o    Save the source file explicitly as .xlsx (not .xls, .csv, or .txt).
o    Remove unnecessary formatting, formulas, or pivot tables — keep it as a simple table with headers.
2.    Re-link the data source
o    In Word, go to Mailings > Select Recipients > Use an Existing List.
o    Browse to the Excel file again and select the correct worksheet/table.
o    If prompted, choose “OLE DB Database Files” instead of “MS Excel Converter.”
3.    Disable background updates
o    In Word, go to File > Options > Advanced.
o    Scroll to General and uncheck “Update automatic links at open.”
o    This prevents Word from hanging while refreshing linked objects.
4.    Check Trust Center settings
o    Go to File > Options > Trust Center > Trust Center Settings.
o    Under External Content, allow data connections and linked workbook updates (for testing purpose).
5.    Repair Office installation
o    In Control Panel > Programs > Microsoft Office > Change, run a Quick Repair.
o    If that doesn’t help, try Online Repair.
6.    Rollback or update
o    If the issue started after a specific Office update, check if a newer patch is available.
o    Alternatively, you can roll back to the previous build using Office Deployment Tool if this is enterprise-managed.