Thank you very much for the reply...
If you are making calls to .close () and .Dispose (), ie they are closing in Page_Unload ()
The reports are part of my application, I Might you better explain the issue of licensing ...
Well, my web application is in my company's own development, but is accessed from different cities within my country (I live in Peru) ... I had never had these problems with the licenses previously had: Visual Studio + Crystal Reports (version which matched the Visual Studio).
So I came to understand, need some kind of special licensing to do that ?.
Jorge.