Error Messsage " Failed to export report" in Crystal Report v 12.2

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Hi

We recently upgraded from CrystalReport Runtime from version 11.5 to 12.2 (to support windows 2008) and i am getting the following error when i try to view a report

Message: Failed to export report: ado. Error Message: This field name is not known.

Details: errorKind

Error in File rpt_adTranscriptUnofficial {B8D43610-89C0-48E2-93AD-D2212C1CA1B2}.rpt:

Error in formula TermLength:

'ToText({ado.IsRegularTerm}) & "-" & ToText(DateDiff ("d", {ado.termStart} , {ado.termEnd}))

This report works fine in 11.5 version so i know that there is no problem with the report /data source etc.

I found this defect "ADAPT01313677" and it says that this was fixed in Fix pack 2.3 , I installed Fixpack 2.3 and that did not solve the issue , I have upgraded to Fix pack 2.5 and i am still getting the same error message.

The report is being called from a Web Application ( i have a binch of reports that work fine ) and when i remove this formula and delete all references to this the report works fine.

I would appreciate any help.