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identifier is null
com.dotmarketing.exception.DotDataException: identifier is null at com.dotmarketing.portlets.files.business.FileFactoryImpl.saveFile(FileFactoryImpl.java:175) at com.dotmarketing.portlets.files.business.FileAPIImpl.saveFile(FileAPIImpl.java:473) at com.dotmarketing.portlets.files.business.FileAPIImpl.saveFile(FileAPIImpl.java:437) at org.dotcms.plugins.XMLSitemap.thread.XMLSitemapThread.closeFileWriter(XMLSitemapThread.java:714) at org.dotcms.plugins.XMLSitemap.thread.XMLSitemapThread.generateSitemapPerHost(XMLSitemapThread.java:455) at org.dotcms.plugins.XMLSitemap.thread.XMLSitemapThread.execute(XMLSitemapThread.java:130) at org.quartz.core.JobRunShell.run(JobRunShell.java:223) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)Caused by: com.dotmarketing.business.DotStateException: identifier is null at com.dotmarketing.business.IdentifierFactoryImpl.loadFromDb(IdentifierFactoryImpl.java:168) at com.dotmarketing.business.IdentifierFactoryImpl.find(IdentifierFactoryImpl.java:411) at com.dotmarketing.business.IdentifierFactoryImpl.find(IdentifierFactoryImpl.java:219) at com.dotmarketing.business.IdentifierAPIImpl.find(IdentifierAPIImpl.java:88) at com.dotmarketing.cache.WorkingCache.addToWorkingAssetToCache(WorkingCache.java:39) at com.dotmarketing.portlets.files.business.FileFactoryImpl.saveFile(FileFactoryImpl.java:166) ... 7 more