Deploying expression builder plug-in

I have written a small plug-in for the expression builder to nicely format first and last name to be output into a report. This function works fine in the Birt report design environment, but when the reports are deployed (using WebViewerExample from birt-runtime-2_3_1) I get this error: 
 
org.eclipse.birt.report.engine.api.EngineException: Fail to compute value for computed column "mem_fullname". A BIRT exception occurred: There are errors evaluating script 
"VMCEStringUtil.VMCEFormatName(row["dsMembers::mem_fname"], 
row["dsMembers::mem_lname"])": ReferenceError: "VMCEStringUtil" is not defined. (#1).. See next exception for more information. There are errors evaluating script "VMCEStringUtil.VMCEFormatName(row["dsMembers::mem_fname"], row["dsMembers::mem_lname"])": ReferenceError: "VMCEStringUtil" is not defined. (#1). 
 
Here is the exception stack trace: 
org.eclipse.birt.report.engine.api.EngineException: Fail to compute value for computed column "mem_fullname". A BIRT exception occurred: There are errors evaluating script "VMCEStringUtil.VMCEFormatName(row["dsMembers::mem_fname"], row["dsMembers::mem_lname"])": ReferenceError: "VMCEStringUtil" is not defined. (<inline>#1).. See next exception for more information. There are errors evaluating script "VMCEStringUtil.VMCEFormatName(row["dsMembers::mem_fname"], row["dsMembers::mem_lname"])": ReferenceError: "VMCEStringUtil" is not defined. (<inline>#1). at org.eclipse.birt.report.engine.executor.ExecutionContext.addException(ExecutionContext.java:1109) at org.eclipse.birt.report.engine.executor.ExecutionContext.addException(ExecutionContext.java:1073) at org.eclipse.birt.report.engine.executor.QueryItemExecutor.executeQuery(QueryItemExecutor.java:88) at org.eclipse.birt.report.engine.executor.TableItemExecutor.execute(TableItemExecutor.java:62) at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.execute(WrappedReportItemExecutor.java:45) at org.eclipse.birt.report.engine.internal.executor.emitter.ReportItemEmitterExecutor.execute(ReportItemEmitterExecutor.java:45) at org.eclipse.birt.report.engine.internal.executor.dup.SuppressDuplicateItemExecutor.execute(SuppressDuplicateItemExecutor.java:42) at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:63) at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layout(HTMLPageLM.java:90) at org.eclipse.birt.report.engine.layout.html.HTMLReportLayoutEngine.layout(HTMLReportLayoutEngine.java:101) at org.eclipse.birt.report.engine.presentation.ReportDocumentBuilder.build(ReportDocumentBuilder.java:231) at org.eclipse.birt.report.engine.api.impl.RunTask.doRun(RunTask.java:237) at org.eclipse.birt.report.engine.api.impl.RunTask.run(RunTask.java:90) at org.eclipse.birt.report.service.ReportEngineService.runReport(ReportEngineService.java:1164) at org.eclipse.birt.report.service.BirtViewerReportService.runReport(BirtViewerReportService.java:155) at org.eclipse.birt.report.service.actionhandler.BirtRunReportActionHandler.__execute(BirtRunReportActionHandler.java:81) at org.eclipse.birt.report.service.actionhandler.BirtChangeParameterActionHandler.runReport(BirtChangeParameterActionHandler.java:57) at org.eclipse.birt.report.service.actionhandler.AbstractChangeParameterActionHandler.__execute(AbstractChangeParameterActionHandler.java:53) at org.eclipse.birt.report.service.actionhandler.AbstractBaseActionHandler.execute(AbstractBaseActionHandler.java:90) at org.eclipse.birt.report.soapengine.processor.AbstractBaseDocumentProcessor.__executeAction(AbstractBaseDocumentProcessor.java:47) at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.executeAction(AbstractBaseComponentProcessor.java:143) at org.eclipse.birt.report.soapengine.processor.BirtDocumentProcessor.handleChangeParameter(BirtDocumentProcessor.java:100) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(AbstractBaseComponentProcessor.java:112) at org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(BirtSoapBindingImpl.java:66) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397) at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186) at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323) at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32) at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118) at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83) at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454) at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281) at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699) at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doPost(BirtSoapMessageDispatcherServlet.java:225) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.service(BirtSoapMessageDispatcherServlet.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.eclipse.birt.report.filter.ViewerFilter.doFilter(ViewerFilter.java:68) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) at java.lang.Thread.run(Thread.java:595) Caused by: org.eclipse.birt.data.engine.core.DataException: Fail to compute value for computed column "mem_fullname". A BIRT exception occurred: There are errors evaluating script "VMCEStringUtil.VMCEFormatName(row["dsMembers::mem_fname"], row["dsMembers::mem_lname"])": ReferenceError: "VMCEStringUtil" is not defined. (<inline>#1).. See next exception for more information. There are errors evaluating script "VMCEStringUtil.VMCEFormatName(row["dsMembers::mem_fname"], row["dsMembers::mem_lname"])": ReferenceError: "VMCEStringUtil" is not defined. (<inline>#1). at org.eclipse.birt.data.engine.impl.ComputedColumnHelperInstance.process(ComputedColumnHelper.java:433) at org.eclipse.birt.data.engine.impl.ComputedColumnHelper.process(ComputedColumnHelper.java:111) at org.eclipse.birt.data.engine.executor.cache.RowResultSet.processFetchEvent(RowResultSet.java:143) at org.eclipse.birt.data.engine.executor.cache.RowResultSet.next(RowResultSet.java:107) at org.eclipse.birt.data.engine.executor.cache.ExpandableRowResultSet.next(ExpandableRowResultSet.java:64) at org.eclipse.birt.data.engine.executor.cache.SmartCacheHelper.populateData(SmartCacheHelper.java:301) at org.eclipse.birt.data.engine.executor.cache.SmartCacheHelper.initInstance(SmartCacheHelper.java:273) at org.eclipse.birt.data.engine.executor.cache.SmartCacheHelper.getResultSetCache(SmartCacheHelper.java:235) at org.eclipse.birt.data.engine.executor.cache.SmartCache.<init>(SmartCache.java:74) at org.eclipse.birt.data.engine.executor.transform.pass.PassUtil.populateOdiResultSet(PassUtil.java:123) at org.eclipse.birt.data.engine.executor.transform.pass.PassUtil.pass(PassUtil.java:62) at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.populateResultSetCacheInResultSetPopulator(PassManager.java:321) at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.doPopulation(PassManager.java:275) at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.doMultiPass(PassManager.java:227) at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.pass(PassManager.java:93) at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.populateResultSet(PassManager.java:70) at org.eclipse.birt.data.engine.executor.transform.ResultSetPopulator.populateResultSet(ResultSetPopulator.java:196) at org.eclipse.birt.data.engine.executor.transform.CachedResultSet.<init>(CachedResultSet.java:109) at 
-- the rest is left out due to space constraints. 
 
Can anyone shed any light on why this happens & how I can fix/get around it? 
 
Thanks, 
 
Keith

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