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I'm using a join and parametized trigger. I get the following exception with stack trace:

FATAL: hudson/plugins/parameterizedtrigger/BuildTrigger
java.lang.NoClassDefFoundError: hudson/plugins/parameterizedtrigger/BuildTrigger
at join.JoinTrigger.getBuildTriggerConfigs(JoinTrigger.java:182)
at join.JoinTrigger.getParameterizedDownstreamProjects(JoinTrigger.java:169)
at join.JoinTrigger.getAllDownstream(JoinTrigger.java:218)
at join.JoinTrigger.perform(JoinTrigger.java:113)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:804)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:779)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:726)
at hudson.model.Run.execute(Run.java:1568)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:236)
Caused by: java.lang.ClassNotFoundException: hudson.plugins.parameterizedtrigger.BuildTrigger
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 13 more