Does anyone know what this error, means and how I can fix it.

It only happens, in the compiled version of the program (The one that runs independantly of VB), It doesn't occur in the version that needs VB.

It also only started happening in the new version of the program, and I don't know what it means!

Heres the error;

"Run time error 401"
"Cant show non-modal form when modal form is displayed"