Error updating source code with Subversion

com.atlassian.bamboo.repository.RepositoryException: Struts 2 SVN - Main Build
	at com.atlassian.bamboo.repository.svn.SvnRepository.getChangesSinceLastBuild(SvnRepository.java:281)
	at com.atlassian.bamboo.build.strategy.PollingBuildStrategy.requiresBuild(PollingBuildStrategy.java:126)
	at com.atlassian.bamboo.build.DefaultBuildChangeDetector.checkIfBuildNeedsBuilding(DefaultBuildChangeDetector.java:166)
	at com.atlassian.bamboo.build.DefaultBuildChangeDetector.doTask(DefaultBuildChangeDetector.java:114)
	at com.atlassian.bamboo.build.DefaultBuildChangeDetector.run(DefaultBuildChangeDetector.java:77)
	at java.lang.Thread.run(Thread.java:595)
Caused by: org.tmatesoft.svn.core.SVNException: svn: Failed to add file 'core/src/main/resources/META-INF/struts-tags.tld': object of the same name already exists
	at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:48)
	at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:503)
	at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:229)
	at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:217)
	at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.doReport(DAVConnection.java:219)
	at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.doReport(DAVConnection.java:211)
	at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.update(DAVRepository.java:601)
	at org.tmatesoft.svn.core.wc.SVNUpdateClient.doUpdate(SVNUpdateClient.java:162)
	at com.atlassian.bamboo.repository.svn.SvnRepository.update(SvnRepository.java:601)
	at com.atlassian.bamboo.repository.svn.SvnRepository.getChangesSinceLastBuild(SvnRepository.java:258)
	... 5 more