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

I had a similar issue, on my development PC it was working just fine. Funny thing was I had two separate calls to the same routine, one worked and the other didn't. On a production PC, kept getting the error. Tried renaming the routine, changing the parameters, parameter types to no avail.

What worked for me was to move the failing calling routine into the same module as the called subroutine.

The routine that was working previously was already in the same module.