2016-10-21 15:31:37,763 ERROR info.magnolia.module.InstallContextImpl           : [393/1206 tasks - Magnolia Mail Module (version 5.4.0-beta1)]> Error while installing or updating mail module. Task 'Bootstrap mail commnand' failed. (ItemExistsException: a node with uuid d3ce3d3f-80b8-43c8-941c-97cefdfd2ec1 already exists!)
java.lang.RuntimeException: Error importing config.modules.mail.commands.default.sendMail: a node with uuid d3ce3d3f-80b8-43c8-941c-97cefdfd2ec1 already exists!
        at info.magnolia.importexport.DataTransporter.importXmlStream(DataTransporter.java:385)
        at info.magnolia.importexport.DataTransporter.importXmlStream(DataTransporter.java:240)
        at info.magnolia.importexport.BootstrapUtil.bootstrap(BootstrapUtil.java:135)
        at info.magnolia.module.delta.BootstrapResourcesTask.execute(BootstrapResourcesTask.java:73)
        at info.magnolia.module.ModuleManagerImpl.applyDeltas(ModuleManagerImpl.java:545)
        at info.magnolia.module.ModuleManagerImpl.installOrUpdateModule(ModuleManagerImpl.java:527)
        at info.magnolia.module.ModuleManagerImpl$1.doExec(ModuleManagerImpl.java:302)
        at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:429)
        at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:426)
        at info.magnolia.context.MgnlContext.doInSystemContext(MgnlContext.java:400)
        at info.magnolia.module.ModuleManagerImpl.performInstallOrUpdate(ModuleManagerImpl.java:296)
        at info.magnolia.module.ui.ModuleManagerWebUI$2.run(ModuleManagerWebUI.java:123)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.xml.sax.SAXException: a node with uuid d3ce3d3f-80b8-43c8-941c-97cefdfd2ec1 already exists!
javax.jcr.ItemExistsException: a node with uuid d3ce3d3f-80b8-43c8-941c-97cefdfd2ec1 already exists!
        at org.apache.jackrabbit.core.xml.SysViewImportHandler.processNode(SysViewImportHandler.java:104)
        at org.apache.jackrabbit.core.xml.SysViewImportHandler.endElement(SysViewImportHandler.java:248)
        at org.apache.jackrabbit.core.xml.ImportHandler.endElement(ImportHandler.java:195)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at info.magnolia.importexport.filters.ImportXmlRootFilter.endElement(ImportXmlRootFilter.java:78)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at info.magnolia.importexport.filters.SkipNodeFilter.endElement(SkipNodeFilter.java:102)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at info.magnolia.importexport.filters.RemoveMixversionableFilter.endElement(RemoveMixversionableFilter.java:123)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at info.magnolia.importexport.filters.VersionFilter.endElement(VersionFilter.java:86)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at info.magnolia.importexport.filters.MagnoliaV2Filter.endElement(MagnoliaV2Filter.java:91)
        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at info.magnolia.importexport.DataTransporter.importXmlStream(DataTransporter.java:342)
        ... 12 more