Input Mask Overflow Error Message

[verybasicuser]

Hi

Started a new table... changed the data type to date/time... went to the input mask and think I made a couple of keystroke errors... cancelled out of it and attempted to start again

Now everytime I go to the input mask an information box comes up with "Overflow" and then the wizard box comes up with nothing within it. I try to click on "edit list" but it does not respond to anything. I try and open a new database and attempt the same thing but it seems to have infected every single database I create or have already created... bit of an inconvenience

Can anybody help with this?

Thanks