Did you try Fred's suggestion?
Problems with the References collection can be caused by differences in
either the location or file version of certain files between the machine
where the application was developed, and where it's being run (or the file
missing completely from the target machine). These can occur even on the
machine on which the application was developed if new software is installed.
On the machine(s) where it's not working, open any code module (or open the
Debug Window, using Ctrl-G, provided you haven't selected the "keep debug
window on top" option). Select Tools | References from the menu bar. Examine
all of the selected references.
If any of the selected references have "MISSING:" in front of them, unselect
them, and back out of the dialog. If you really need the reference(s) you
just unselected (you can tell by doing a Compile All Modules), go back in
and reselect them.
If none have "MISSING:", select an additional reference at random, back out
of the dialog, then go back in and unselect the reference you just added. If
that doesn't solve the problem, try to unselect as many of the selected
references as you can (Access may not let you unselect them all), back out
of the dialog, then go back in and reselect the references you just
unselected. (NOTE: write down what the references are before you delete
them, because they'll be in a different order when you go back in)
For far more than you could ever want to know about this problem, check out
http://www.accessmvp.com/djsteele/AccessReferenceErrors.html, or check my
December, 2003 "Access Answers" column in Pinnacle Publication's "Smart
Access" (you can download the column, and sample database, for free at
http://www.accessmvp.com/DJSteele/SmartAccess.html)