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This exception has no message.
java.lang.NullPointerException: 	at org.jvnet.hudson.plugins.SbtPluginBuilder.buildCmdLine(SbtPluginBuilder.java:159)	at org.jvnet.hudson.plugins.SbtPluginBuilder.perform(SbtPluginBuilder.java:111)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:740)	at hudson.model.Build$BuildExecution.build(Build.java:198)	at hudson.model.Build$BuildExecution.doRun(Build.java:159)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:519)	at hudson.model.Run.execute(Run.java:1703)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:231)