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java.lang.NullPointerException: 	at org.obiba.magma.datasource.excel.ExcelDatasource.mapSheetHeader(ExcelDatasource.java:193)	at org.obiba.magma.datasource.excel.ExcelValueTable.readVariables(ExcelValueTable.java:156)	at org.obiba.magma.datasource.excel.ExcelValueTable.initialise(ExcelValueTable.java:58)	at org.obiba.magma.support.Initialisables.initialise(Initialisables.java:10)	at org.obiba.magma.support.Initialisables.initialise(Initialisables.java:20)	at org.obiba.magma.support.AbstractDatasource.initialise(AbstractDatasource.java:83)	at org.obiba.magma.support.Initialisables.initialise(Initialisables.java:10)	at org.obiba.magma.MagmaEngine.addDatasource(MagmaEngine.java:84)	at org.obiba.opal.core.service.impl.DefaultExportServiceImpl.buildExcelDatasource(DefaultExportServiceImpl.java:110)	at org.obiba.opal.core.service.impl.DefaultExportServiceImpl.exportTablesToExcelFile(DefaultExportServiceImpl.java:84)	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 $Proxy45.exportTablesToExcelFile(Unknown Source)	at org.obiba.opal.cli.client.command.ExportCommand.execute(ExportCommand.java:38)	at org.obiba.opal.cli.client.OpalConsole.prompt(OpalConsole.java:142)	at org.obiba.opal.cli.client.OpalConsole.(OpalConsole.java:109)	at org.obiba.opal.cli.client.OpalConsole.main(OpalConsole.java:191)