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java.lang.NullPointerException: file must not be null	at com.microsoft.tfs.util.Check.throwForNull(Check.java:135)	at com.microsoft.tfs.util.Check.notNull(Check.java:28)	at com.microsoft.tfs.core.clients.versioncontrol.workspacecache.internal.InternalCacheLoader.loadConfig(InternalCacheLoader.java:89)	at com.microsoft.tfs.core.clients.versioncontrol.Workstation.(Workstation.java:150)	at com.microsoft.tfs.core.clients.versioncontrol.Workstation.getCurrent(Workstation.java:206)	at com.microsoft.tfs.core.clients.versioncontrol.VersionControlClient.(VersionControlClient.java:450)	at com.microsoft.tfs.core.clients.versioncontrol.VersionControlClient.(VersionControlClient.java:520)	at com.microsoft.tfs.core.config.client.DefaultClientFactory$7.newClient(DefaultClientFactory.java:238)	at com.microsoft.tfs.core.config.client.DefaultClientFactory.newClient(DefaultClientFactory.java:91)	at com.microsoft.tfs.core.TFSConnection.getClient(TFSConnection.java:1470)	at com.microsoft.tfs.core.TFSTeamProjectCollection.getVersionControlClient(TFSTeamProjectCollection.java:359)	at hudson.plugins.tfs.model.Project.getVCCHistory(Project.java:89)	at hudson.plugins.tfs.model.Project.getDetailedHistory(Project.java:128)	at hudson.plugins.tfs.actions.CheckoutAction.checkout(CheckoutAction.java:56)	at hudson.plugins.tfs.TeamFoundationServerScm.checkout(TeamFoundationServerScm.java:176)	at hudson.model.AbstractProject.checkout(AbstractProject.java:1253)	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:622)	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:528)	at hudson.model.Run.execute(Run.java:1754)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:89)	at hudson.model.Executor.run(Executor.java:240)