Attempting a public key authentication with username build
Failed to authenticate: svn: File 'NULL' is not valid OpenSSH DSA or RSA private key file
org.tmatesoft.svn.core.SVNAuthenticationException: svn: Authentication failed for /* removed */ 
	at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.authenticationFailed(SVNErrorManager.java:47)
	at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.authenticationFailed(SVNErrorManager.java:41)
	at hudson.scm.UserProvidedCredential$AuthenticationManagerImpl.getNextAuthentication(UserProvidedCredential.java:223)
	at org.tmatesoft.svn.core.internal.io.svn.SVNSSHConnector.open(SVNSSHConnector.java:104)
	at org.tmatesoft.svn.core.internal.io.svn.SVNConnection.open(SVNConnection.java:74)
	at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.openConnection(SVNRepositoryImpl.java:1242)
	at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.testConnection(SVNRepositoryImpl.java:95)
	at hudson.scm.SubversionSCM$DescriptorImpl.postCredential(SubversionSCM.java:1792)
	at hudson.scm.SubversionSCM$DescriptorImpl.doPostCredential(SubversionSCM.java:1737)
	at sun.reflect.GeneratedMethodAccessor181.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:282)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:149)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:88)
	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:102)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:562)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:640)
	at org.kohsuke.stapler.MetaClass$7.doDispatch(MetaClass.java:242)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:562)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:640)
	at org.kohsuke.stapler.MetaClass$7.doDispatch(MetaClass.java:242)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:562)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:640)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:478)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:160)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
	at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)
	at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)
	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
	at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:51)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:97)
	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
	at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
	at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
	at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
	at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
	at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
	at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244)
	at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
	at java.lang.Thread.run(Thread.java:662