What does "Overflow" mean in Access?

[AndyH]

When I try to open a form it come up with a warning message which simply
states "Overflow" does any one know what this means and how to address it?

 

[Andi Mayer]

When I try to open a form it come up with a warning message which simply
states "Overflow" does any one know what this means and how to address it?

is it run-time error "6" ?
if yes then you have for example an integer which value is higher as
32,767