Runtime error: UFL 'u25total.dll' that implements this function is missing

Question

Has anyone seen this error when printing reports at runtime?
HandlingInstanceID: 34db0437-5151-48f1-b737-8aa06b53a7ed
An exception of type 'System.Runtime.InteropServices.COMException' occurred and was caught.
11/14/2008 09:03:20
Type : System.Runtime.InteropServices.COMException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : UFL 'u25total.dll' that implements this function is missing.
Source : Crystal Reports ActiveX Designer
Help link :
ErrorCode : -2147191835
Data : System.Collections.ListDictionaryInternal
TargetSite : Void PrintOut(System.Object, System.Object, System.Object, System.Object, System.Object)
Stack Trace :    at CRAXDRT.ReportClass.PrintOut(Object promptUser, Object numberOfCopy, Object collated, Object startPageN, Object stopPageN)
We develop our reports in CR Developer Product Type: Full version 11.5.8.826 and the main application is a windows .net C# application. At our branch locations we have CR XI2 SP3 installed. Currently we have our application at over 400 locations and this error keeps coming up sporadically. Once the users click through the error and print again they have no problems. I haven't been able to reproduce this error so any help would be very much appreciated.

Answer 1

Don,
I talked this over with my team members here is what we are going to try. We are going to add mutex around our print code that contains the following:
CRAXDRT.ApplicationClass reportApplication = new CRAXDRT.ApplicationClass();
CRAXDRT.Report legacyReport;
After adding the mutex to the code we still received an exception. So in the interest of trying to free up the resources associated to that DLL we added the following inside of the mutex after the print code.
reportApplication = null;
legacyReport = null;
GC.Collect();
GC.WaitForPendingFinalizers();
After doing that I havenu2019t been able to reproduce the problem. Is there anything else in the com objects that could be holding that resource open.