Failed to get page - crystalreportvi ewer

[Chuck P]

We have an web application developed that uses the crystalreportvi ewer
component to display reports. Sometimes when switching between pages
of the report we are randomly getting the following error:
Fail to get the specific page.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.Exceptio n: Fail to get the specific page.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.

Stack Trace:
[Exception: Fail to get the specific page.]
CrystalDecision s.Web.ReportAge nt.|(Boolean I) +549
CrystalDecision s.Web.CrystalRe portViewer.OnPr eRender(EventAr gs e) +143
System.Web.UI.C ontrol.PreRende rRecursiveInter nal() +62
System.Web.UI.C ontrol.PreRende rRecursiveInter nal() +125
System.Web.UI.C ontrol.PreRende rRecursiveInter nal() +125
System.Web.UI.P age.ProcessRequ estMain() +1489

Version Information: Microsoft .NET Framework Version:1.1.432 2.573;
ASP.NET Version:1.1.432 2.573
*****
Any ideas what could be causing this?