java.sql.SQLException: Got a null connection

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java.sql.SQLException: Got a null connection
at com.thortech.xl.dataaccess.tcDataBase.readPartialStatement(Unknown Source)
at com.thortech.xl.dataobj.tcDataBase.readPartialStatement(Unknown Source)
at com.thortech.xl.dataaccess.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.dataobj.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.dataaccess.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.dataobj.tcDataSet.executeQuery(Unknown Source)
at com.thortech.xl.ejb.beansimpl.tcHelpOperationsBean.getHelpAbout(Unknown Source)
at com.thortech.xl.ejb.beans.tcHelpOperationsSession.getHelpAbout(Unknown Source)
at sun.reflect.GeneratedMethodAccessor275.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.evermind.server.ejb.interceptor.joinpoint.EJBJoinPointImpl.invoke(EJBJoinPointImpl.java:35)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:52)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.TxRequiredInterceptor.invoke(TxRequiredInterceptor.java:50)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.SecurityRoleInterceptor.invoke(SecurityRoleInterceptor.java:47)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:52)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.InvocationContextPool.invoke(InvocationContextPool.java:55)
at com.evermind.server.ejb.StatelessSessionEJBObject.OC4J_invokeMethod(StatelessSessionEJBObject.java:87)
at sun.reflect.GeneratedMethodAccessor280.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.evermind.server.rmi.RmiMethodCall.run(RmiMethodCall.java:53)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)

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