Crystal Report Windows Forms Viewer error: "The field name is not known"

Hi,
My report runs fine in the Crystal Reports viewer. When we try to view the crystal report through a piece of 3rd party software, I start to get errors in a few of my formulas indicating that "the field name is not known". I can clearly see that the field is in my crystal report. Has anyone else had this problem? Any ideas on what might be happening?
Thank you.

Just to provide some further clarification on my problem:
The "field name is not known" error seems to be occurring only in a few formulas where I have a statement like this:
if ISNULL({somefieldfromdatabase}) Then
I've used this for many other formulas and not had an issue with them. I've verified that the database and the stored procedure contain this field.

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[COMException (0x80041019): This field name is not known.
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Thanks,
Details:
The reports are not "visual", they are created within a DLL that saves them as PDF's and/or prints them directly.
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Hi,
Thanks for your replies.
Falk:
Nothing in particular was done to upgrade the files, other than to upgrade the VB project to reference the Crystal 9 dll's and such instead of Crystal 8.5.
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At this point I "give up".
VB Express 2008 was used to "upgrade" the VB project to .Net and then convert the DSR's to new format RPT's. They were then loaded into a fresh VS 2008 (C#) project.
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Thanks again,
Edited by: pzkpfw on Aug 14, 2008 12:19 AM clarify
Edited by: pzkpfw on Aug 14, 2008 12:21 AM
Edited by: pzkpfw on Aug 14, 2008 5:16 AM

This field name is not known errorKindError

Hi!
I am developing a user interface from ASP.NET/C# (.NET framework version 2.0) to allow users to view the crystal report as a PDF document. I am using ORACLE 10g parameterized Stored Procedure to retrieve the data from the database.
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Hi;
I don't see in your code where you are passing the stored procedure parameter to the subreport. This could be what is missing. Have a look at the samples here:
https://smpdl.sap-ag.de/~sapidp/012002523100006252712008E/csharp_web_smpl.exe
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This Field Name is not Known

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Crystal Report Windows Forms Viewer error: "The field name is not known"

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