Vb.net – Crystal is not generating code for upgraded report with UFL Library for upgraded project from VS2008 to VS2012

i have a solution developed in VS 2008 and 3.5 in VB with almost 38 projects (class libraries) in it. This whole thing is big project with almost 140 reports (crystal reports) in it.

now i install Visual Studio 2012 Ultimate with Crystal Report (CRforVS_13_0_7)
and upgraded my solution to .net 4.5 everything works fine.

some of my reports uses a library written in VB.net CRUFL for InWord support in indian rupee format

now i am facing problem with upgrading reports to new crystal report format.
when i open any report file and verify and save it asks me to save in new crystal report format if i choose yes to upgrade i get error from crystal code generator

Custom tool error: "Code generator 'ReportCodeGenerator' failed.  Exception stack = CrystalDecisions.Shared.CrystalReportsException: Load report failed. ---> System.Runtime.InteropServices.COMException: UFL 'u212com.dll' that implements this function is missing.
Error in File repAbstract {B0F50159-6708-4E3E-A668-899D0616325C}.rpt:
Error in formula  drInWord: 
'UniSuiteReportingEXReportingEXToWords (ABS(Sum ({@drAmount})))'
UFL 'u212com.dll' that implements this function is missing.
   at CrystalDecisions.ReportAppServer.ClientDoc.ReportClientDocumentClass.Open(Object& DocumentPath, Int32 Options)
   at CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.Open(Object& DocumentPath, Int32 Options)
   at CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened()
   --- End of inner exception stack trace ---
   at CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened()
   at CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename, OpenReportMethod openMethod, Int16 parentJob)
   at CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename)
   at CrystalDecisions.VSDesigner.CodeGen.ReportClassWriter..ctor(String filePath)
   at CrystalDecisions.VSDesigner.CodeGen.ReportClassWriter..ctor(String filePath, String resourceNamespace)
   at CrystalDecisions.VSDesigner.CodeGen.ReportCodeGenerator.GenerateCode(String inputFileName, String inputFileContent)"  Z:\World Of Programming\Product\VS .Net\Products\Uni Suite\Uni Suite 2.0\Uni_Suite.Reports\repAbstract.rpt  1   1   Uni_Suite.Reports

• What I figured out that the problem is with CRUFL function,

• If I comment function in formula and just return normal string in it
  and flow the process report upgrades and works fine.

• If I add new report and use this function is formula that also works
  fine.

• I created completely new library written in 4.5 for any upgrading
  wizard errors but the behavior is same.

This is clear I cannot create all these reports again in new version, count is huge and some of them are very complex.

Am I missing something of is there anything I have to study first before upgrading my project

Please suggest

one more thing OS is windows 8.1 Pro