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java.lang.NullPointerException: 	at hudson.scm.SubversionSCM$DescriptorImpl$1.onSuccess(SubversionSCM.java:2249)	at hudson.scm.UserProvidedCredential$AuthenticationManagerImpl.acknowledgeAuthentication(UserProvidedCredential.java:233)	at org.tmatesoft.svn.core.auth.BasicAuthenticationManager.acknowledgeAuthentication(BasicAuthenticationManager.java:56)	at org.tmatesoft.svn.core.internal.io.svn.sasl.SVNSaslAuthenticator.authenticate(SVNSaslAuthenticator.java:101)	at org.tmatesoft.svn.core.internal.io.svn.SVNConnection.authenticate(SVNConnection.java:194)	at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.authenticate(SVNRepositoryImpl.java:1275)	at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.openConnection(SVNRepositoryImpl.java:1253)	at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.testConnection(SVNRepositoryImpl.java:95)	at hudson.scm.SubversionSCM$DescriptorImpl.postCredential(SubversionSCM.java:2258)	at hudson.scm.SubversionSCM$DescriptorImpl.doPostCredential(SubversionSCM.java:2203)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:120)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:728)