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java.lang.NullPointerException: 	at org.obiba.magma.datasource.excel.ExcelDatasource.onDispose(ExcelDatasource.java:106)	at org.obiba.magma.support.AbstractDatasource.dispose(AbstractDatasource.java:91)	at org.obiba.magma.support.Disposables.dispose(Disposables.java:22)	at org.obiba.magma.MagmaEngine.removeDatasource(MagmaEngine.java:105)	at org.obiba.opal.core.service.impl.DefaultExportServiceImpl.exportTablesToExcelFile(DefaultExportServiceImpl.java:89)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at undefined.$Proxy40.exportTablesToExcelFile(Unknown Source)	at org.obiba.opal.shell.commands.ExportCommand.execute(ExportCommand.java:35)	at org.obiba.opal.shell.AbstractOpalShell.run(AbstractOpalShell.java:53)	at java.lang.Thread.run(Unknown Source)