Well, I don't use CrystalReports. By the error message either the file you gave the report doesn't exist (or the path to it is wrong), or the file is already held open by some other code in your app or some other external application. Did your code open this file somewhere else and not close it??
A guide to posting questions on CodeProject[^]
Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
2006, 2007