ClassCastException

While trying to merge pdf's created with i-net crystal clear reports 7.x i get the below exception

Exception in thread "main" java.lang.ClassCastException: com.cete.dynamicpdf.merger.jb cannot be cast to com.cete.dynamicpdf.merger.db
        at com.cete.dynamicpdf.merger.PdfPage.n(Unknown Source)
        at com.cete.dynamicpdf.merger.PdfPage.k(Unknown Source)
        at com.cete.dynamicpdf.merger.ImportedPage.<init>(Unknown Source)
        at com.cete.dynamicpdf.merger.MergeDocument.a(Unknown Source)
        at com.cete.dynamicpdf.merger.MergeDocument.a(Unknown Source)
        at com.cete.dynamicpdf.merger.MergeDocument.<init>(Unknown Source)

Hello,

Can you please try using the latest build of our product? You can download the latest build from our CustomerArea by logging in using your current serial number. If you are still having a problem then please send over the PDF document you are using to our Support Team so that they can look into it further.

Thanks,
ceTe Software Support Team.