How to fix Exception from HRESULT: 0x800A03EC at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous) at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args) at System.Wi

Dear AR,

The exception “HRESULT: 0x800A03EC” typically occurs when Excel encounters an issue with automation, such as accessing an invalid range, interacting with a corrupted file, or executing a macro with unsupported syntax.

To begin troubleshooting, we recommend the following steps:

Ensure the Excel file is not open in multiple instances or locked by another process.

If you're using VBA or automation scripts, verify that all referenced ranges, sheets, and objects exist and are correctly defined.

Try repairing the Excel file by opening it via File > Open > Browse, selecting the file, and choosing Open and Repair.

If the issue persists, consider saving the file in a new format (e.g., .xlsx) and re-running the process.

I hope this helps. Just kindly tick Accept Answer that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

Best regards,

Domic Vo