The Ribbon/COM add-in helper required by add-in {0} could not be registered.

[Marcio Rocha dos Santos]

I get a TargetInvocationException on the load of my AddIn.

specifically at the call : comAddIn.GetType().InvokeMember("Connect", BindingFlags.SetProperty, null, comAddIn, new object[] { true }, ci);

What is very weird is that this exception is only thrown when the XLL is loaded from an specific path on my computer.

That is, if I change the name of the XLL file or the directory everything works just fine.

I tried to clear the registry using apps, and manually, but nothing has changed.

Full Exception:

The Ribbon/COM add-in helper required by add-in {0} could not be registered.

This may be due to the helper add-in being disabled by Excel.

To repair, open Disabled items in the Options->Add-Ins page and re-enable target add-in, then restart Excel.

Error details:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException: Operation aborted (Exception from HRESULT: 0x80004004 (E_ABORT))

   --- End of inner exception stack trace ---

   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)

   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)

   at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, CultureInfo culture)

   at ExcelDna.Integration.ExcelComAddInHelper.LoadComAddIn(ExcelComAddIn addIn) in ...\ExcelDna.Integration\ExcelComAddIn.cs:line 145

Do you have any clue about what is happening, or how to fix this?

Best regards,
Marcio

[Marcio Rocha dos Santos]

Hello all,

My problem is related to #this issue, and the solution is here: https://seotoolsforexcel.com/com-add-in-helper-could-not-be-registered/

Tks,

Marcio

[Govert van Drimmelen]

Hi Marcio,

Do you have any suggestion on how the message could be made clearer?

-Govert