CRAXDDRT.Application.OpenReport causing system error from VB

[petherin]

I have a VB program which uses Crystal Reports 8.5 ActiveX Designer Design and Runtime Library (craxddrt.dll). I want to open a report using the CRAXDDRT.Application object, but a Windows system error is occurring when the OpenReport method of the CRAXDDRT.Application object is used.

First, a CRAXDDRT.Report object is created. Then a CRAXDDRT.Application is created, and its OpenReport method is used to open a report which resides on the local hard drive. The path to the report has been verified as correct, but a Windows system error is still created. The error says 'The program has encountered a problem and needs to close.'

Code summary:

Dim objCrystalReport As New CRAXDDRT.Report

Then the following function is called:

Private Function SetupParameters(objCrystalReport As CRAXDDRT.Report) As Boolean

   Dim objCrystalApp As CRAXDDRT.Application   

   Set objCrystalApp = New CRAXDDRT.Application
   Set objCrystalReport = objCrystalApp.OpenReport(sReportPath & sReportName) 'The error occurs when this line is executed

System: Windows XP SP 1
Crystal Reports 8.5.3.975 (SP3 has been applied)
VB6 SP5

Strangely, other reports are opened fine, but others aren't, and there's no discernible difference between them. Can someone tell me what's going on?