COM: OLE Viewer unable to create instance of class

StackOverflow https://stackoverflow.com/questions/1405394

  •  05-07-2019
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Question

Using OLE/COM Viewer I get the following error (when expanding my registered class)

CoGetClassObject failed.
<No system message defined> severity: SEVERITY_ERROR, facility:
<Unknown Facility> ($80131522)

The COM Class is a C# class registered with RegAsm.

What does this error mean?

Edit:

See http://www.dotnet247.com/247reference/msgs/24/124704.aspx for similar issue.

Was it helpful?

Solution 2

Found the problem:

By looking at the fuslogvw logs I learned that OleViewer looks for any assembly in the same folder as OleViewer.exe that matches the assembly it is looking for (!). By chance I had an old version of my assembly in the folder I was running OleViewer from. So what I had to do was to copy OleViewer.exe to the folder where my assembly was registered. Strange but true!

OTHER TIPS

Is there a dependent assembly missing from the bin folder of the COM Registered assembly? Or a dependent assembly that supposed to be in the GAC that isn't actually in the GAC?

You may also be able to resolve you're issue using /codebase switch which will add a registry entry pointing to the location of your assembly.

You might also be able to find out more using fuslogvw to see what's happening when your .NET assemblies are being bound to by OLE Viewer.

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