Hi,
I got the same error message before. The reason I found which cause this error message is, I have Active X control MSCOMM in each of my forms need it. I solve it by storing the reference of MSCOMM object in a public variable and let all of the form to access it.
Hope It helps.
I am not the most powerful man in this world.
I am not the worst man in this world either.
I just as same as all of you.
I still need to learn from my mistakes...