Upload to Confluence File Server is failing on Scheduled Reports

2018-08-17 11:32:05,973 Xporter-752b652e3fdb42b1a261341bae8f096e ERROR anonymous [c.x.j.e.a.i.fileserver.impl.ConfluenceFileServer] ERROR
java.lang.NullPointerException: You have to be logged in to use oauth authentication.
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:226)
at com.atlassian.applinks.oauth.auth.ThreeLeggedOAuthRequestFactoryImpl.createRequest(ThreeLeggedOAuthRequestFactoryImpl.java:83)
at com.atlassian.applinks.core.auth.ApplicationLinkRequestFactoryFactoryImpl$AbsoluteURLRequestFactory.createRequest(ApplicationLinkRequestFactoryFactoryImpl.java:180)
at com.xpandit.jiraxporter.export.api.integration.fileserver.impl.ConfluenceFileServer.sendFile(ConfluenceFileServer.java:137)
at com.xpandit.jiraxporter.component.scheduler.ScheduleReporting.uploadToFileServer(ScheduleReporting.java:407)
at com.xpandit.jiraxporter.component.scheduler.ScheduleReporting.lambda$runJob$0(ScheduleReporting.java:277)
at com.xpandit.jiraxporter.component.bulkexport.BulkExportProcess.finishProcess(BulkExportProcess.java:217)
at com.xpandit.jiraxporter.component.bulkexport.BulkExportProcess.run(BulkExportProcess.java:204)
at java.lang.Thread.run(Thread.java:745)