My depot does not use streams, so I left the Streams field blank on the Manual workspace spec definition. I see the following in the jenkins log

java.lang.InterruptedException: P4: Unable to setup workspace: com.perforce.p4java.exception.RequestException: Error in client specification.
Error detected at line 21.
Unknown field name 'Stream'.

at org.jenkinsci.plugins.p4.tasks.AbstractTask.setWorkspace(AbstractTask.java:63)
at org.jenkinsci.plugins.p4.PerforceScm.checkout(PerforceScm.java:278)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1270)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:609)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:531)
at hudson.model.Run.execute(Run.java:1717)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)