Error msg in Access program

I have, hopefully, a quick easy question.  I have an access 2010 program and one of my users got an error "The expression you entered refers to an object that is closed or does not exist".

They had pressed a button for one screen and then pressed a button for another screen.  The odd thing is that when I do exactly what they did (or claimed to do) I did not get the error.

DOes anyone have an idea as to what I could look for?

Thanks
alevin16Asked:
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
<<DOes anyone have an idea as to what I could look for?>>

 The problem is, the order of events is not always what you think it is.   On a faster/slower machine, forms may open/close faster.

 If your referring to these in code, then it may work fine on one machine and not another.

 Hard to offer anything more with specifics, but think through what your doing at that point and make sure you have good error handling in place.  Consider using MZ Tools (Freeware) to number your code lines and then use the undocumented VBA.ERL to return the line number as part of your error handling.

 This will vastly help pin-point the offending line and problem.

Jim.
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alevin16Author Commented:
Thank you very much, that is exactly what it was.  I am going to work on it now.
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