Got this error when trying out Delivery Pipeline Plugin with 3 freestyle projects that basically echo Hello world and all parsed environment variables from Jenkins.

I also cannot proceed with any MultiJob projects with MultiJob phases, with those 3 new empty freestyle jobs with default parameters.

I don't know which plugin is the culprit, but according to the stacktraces, parameterizedtrigger has the most occurrences.

Let me know if you need more info.