Troubleshooting: “Unable to Cast COM Object” Error When Exporting to Excel

Troubleshooting: “Unable to Cast COM Object” Error When Exporting to Excel

End user  ·  Yellow Dog Inventory 2026

 WHY IT'S IMPORTANT

Yellow Dog Inventory uses your local Microsoft Office installation to export reports and documents to Excel. When that connection fails, the export stops and an error appears. This article covers the most common cause and a repair you or your IT team can run.

 ISSUE

When you export to Excel, an error appears that begins:

Unable to cast COM object of type ‘Microsoft.Office.Interop.Excel.ApplicationClass’…

The export does not complete.

 CAUSE

This usually points to a problem with the local Microsoft Office installation, in one of two forms:

•    Your Microsoft Office suite is out of date.

•    A previous Windows installation left behind registry keys that a Windows 10 install did not clear.

 TROUBLESHOOTING

Start by making sure Microsoft Office is up to date. If it is, repair the Office installation, which resolves the registry-key problem. A Quick Repair does not require an internet connection and keeps your settings.

Note: Clearing registry keys and repairing Office is typically handled by your onsite IT team. Involve them if you are unsure or do not have the access to make these changes.

Repair Microsoft Office (Windows 11)

1.  Open Settings from the Start menu, or press Windows + I.

2.  Go to Apps > Installed apps.

3.  Find your Microsoft application in the list, such as Microsoft 365 or Microsoft Office.

4.  Select the three-dot menu (…) next to it, then select Modify. If prompted by User Account Control, select Yes.

5.  Select Quick Repair, then Repair, and follow the onscreen instructions. Quick Repair runs offline and keeps your settings.

6.  After the repair finishes, try exporting to Excel in Yellow Dog Inventory again.

7.  If the error continues, repeat the steps and select Online Repair instead. Online Repair is more thorough and requires an internet connection.

Older versions: Office 2019, Office 2021, and earlier perpetual-license versions may not appear under Installed apps. In that case, open Control Panel > Programs > Programs and Features, select your Office installation, and choose Change to reach the same Quick Repair and Online Repair options.

 VERIFICATION STEPS

1.  Run the export that previously failed.

2.  Confirm the file opens in Excel without the COM object error.

 WHEN TO CONTACT SUPPORT

Contact Yellow Dog Support if:

•    Microsoft Office is up to date and a Quick Repair does not resolve the error.

•    You do not have the access needed to repair Office or edit registry keys, and onsite IT is unavailable.

•    The error continues after IT has repaired Office and cleared old registry keys.

Phone: 757-663-7514

Support hours: Monday–Friday, 9:00 a.m.–8:00 p.m. EST

Emergency support (available 24/7): 757-663-7514, Option 1

 

 RELATED ARTICLES

•    FAQ: Exporting Reports

Last reviewed: June 2026  ·  Applies to: Yellow Dog Inventory 2026

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