i have two datepicker that changed and modified another fiel, but i changed the datepicker don't refresh the field, I press the print button and
Wow Ruben - that's some error. In my 10+ years working on InfoPath, I have never heard of such an error. My guess is that you have a form that is stuck in an "infinite update" you have a field A that changes a field B which changes field A. Guess what? It will go around and around until it times out. During this roundabout, trying to print may cause the error you mentioned. Just a guess though. Easy fix is to make sure your fields don't change other fields. Make sure you don't have the roundabout. In IP2007, go to Tools->Logic Inspector and take a look-see... happy trails!