<p>Hi all!</p>
<p> </p>
<p>I'm having this error when running my report... Anyone else seen this before and can give me a clue on what's going on? Thanks in advance!</p>
<p> </p>
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<pre class="_prettyXprint _lang-nocode">
2015-11-24 16:35:48,471 SEVERE [org.eclipse.birt.report.engine.api.impl.ReportEngine] An error happened while running the report. Cause:
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableCollection.add(Collections.java:1016)
at org.eclipse.birt.report.engine.toc.TOCBuilder.startEntry(TOCBuilder.java:109)
at org.eclipse.birt.report.engine.toc.TOCBuilder.startGroupEntry(TOCBuilder.java:52)
at org.eclipse.birt.report.engine.executor.ReportItemExecutor.startGroupTOCEntry(ReportItemExecutor.java:758)
at org.eclipse.birt.report.engine.executor.TableGroupExecutor.execute(TableGroupExecutor.java:46)
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.HTMLStackingLM.layoutChildren(HTMLStackingLM.java:27)
at org.eclipse.birt.report.engine.layout.html.HTMLTableLM.layoutChildren(HTMLTableLM.java:76)
at org.eclipse.birt.report.engine.layout.html.HTMLAbstractLM.layout(HTMLAbstractLM.java:133)
at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:68)
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)
</pre>
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<p> </p>
