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java.lang.NullPointerException: 	at edu.harvard.iq.dataverse.DatasetServiceBean.exportAllDatasets(DatasetServiceBean.java:821)	at edu.harvard.iq.dataverse.DatasetServiceBean.exportAllAsync(DatasetServiceBean.java:771)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786)	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:73)	at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)	at sun.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758)	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746)	at com.sun.ejb.containers.EjbAsyncTask.call(EjbAsyncTask.java:101)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)