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    Expert tip

    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.google.jenkins.plugins.metadata.scm.SourceMetadata.(SourceMetadata.java:62)	at com.google.jenkins.plugins.metadata.scm.SourceMetadataExtractor$FromGitBuildActions.getSourceMetadata(SourceMetadataExtractor.java:242)	at com.google.jenkins.plugins.metadata.scm.SourceMetadataExtractor$FromBuildActions.extract(SourceMetadataExtractor.java:139)	at com.google.jenkins.plugins.metadata.scm.SourceMetadataExtractor.extract(SourceMetadataExtractor.java:101)	at com.google.jenkins.plugins.metadata.scm.SourceMetadataBuildListener.onChangeLogParsed(SourceMetadataBuildListener.java:50)	at hudson.model.listeners.SCMListener.onChangeLogParsed(SCMListener.java:120)	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:623)	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529)	at hudson.model.Run.execute(Run.java:1738)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:410)