Creating Jasper Report for Change Implementation

Need some assistance regarding the Change Implementation report.

Previously the Change implementation report was there 11.1 now in windchill 12.0 this report is remove by PTC. Did anyone create a new jasper report for this one.

While fetching the value of Signature step we are facing this error Can anyone help with this one.

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ERROR [ajp-nio-127.0.0.1-8010-exec-2] wt.util.WrappedTimestamp orgadmin - Bad WrappedTimestamp, date string=, date format string = dd MM yyyy HH:mm:ss

ERROR [ajp-nio-127.0.0.1-8010-exec-2] wt.util.WrappedTimestamp orgadmin - Exception java.text.ParseException: Unparseable date: ""

ERROR [ajp-nio-127.0.0.1-8010-exec-2] wt.util.WrappedTimestamp orgadmin - Bad timestamp -

ERROR [ajp-nio-127.0.0.1-8010-exec-2] wt.adapter.exception orgadmin - WTAdapterImpl java.lang.RuntimeException: java.text.ParseException: Unparseable date: ""

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