Runtime Error 49, Bad DLL calling convention

Question

Q. Excel keeps throwing the following error, whenever my addin is loaded (Runtime Error 49, Bad DLL calling convention)

Answer 1

In my case this was "caused" by an excessive use of the continue character _ in a single if conditional

I had already recompiled, checked all return codes, moved modules around ,restarted excel , restarted my computer, copied the code to a brand new Excel spread-sheet, I read this article and the bit about return codes made me think about how many returns can be in an if statement

I had this

    If CompressIntoOneLineON(rg1, rgstart, rgend) or _
       CompressIntoOneLineOS(rg1, rgstart, rgend) or _
       CompressIntoOneLineOGN(rg1, rgstart, rgend) or _
       CompressIntoOneLineOGS(rg1, rgstart, rgend) or _
       CompressIntoOneLineGO(rg1, rgstart, rgend) Then
       
    End If

I was getting the error when the subroutine containing this code exited So I changed to this

matched = True
If CompressIntoOneLineON(rg1, rgstart, rgend) Then
ElseIf CompressIntoOneLineOS(rg1, rgstart, rgend) Then
ElseIf CompressIntoOneLineOGN(rg1, rgstart, rgend) Then
ElseIf CompressIntoOneLineOGS(rg1, rgstart, rgend) Then
ElseIf CompressIntoOneLineGO(rg1, rgstart, rgend) Then
Else
  matched = False
End If
if matched then
  

and the error went away