I have a coustumer that had used my software for over 2 years and this morning called with this problem when tring to run the aplication

the error happens when he starts the aplication he siad that last friday he worked on the sysem and evrithing was fine, this is a payroll application to they use it every day, thay are very used to it and quite knolege able on the aplications operations.

waht can change that will make a very often VFP application to behave like this?

BDH