[xwiki-users] Error in FileSystemMailContentStoreTest when trying to build XWiki from source using Maven

Hello, I am trying to build XWiki from source using 'mvn clean install' I am getting errors at xwiki-platform/xwiki-platform-core/xwiki-platform-mail/xwiki-platform-mail-send/xwiki-platform-mail-send-default/src/test/java/org/xwiki/mail/internal/FileSystemMailContentStoreTest.deleteMailStore:78 The errors are of the form: saveMessageWithCustomMessageId(org.xwiki.mail.internal.FileSystemMailContentStoreTest) java.io.IOException: Unable to delete directory These exceptions cause several JUnit tests to fail, and thus I cannot finish building the project. Any ideas of why this directory and the files in it cannot be deleted? It seems to be trying to delete some temporary files that are created during the build. Thanks, J