The Jenkins Workflow plugin was released in December 2014. For architectural reasons, plugins providing various extensions of interest to builds cannot be made automatically compatible with Workflow. To use plugins from workflow, plugins typically require use of some newer APIs, large or small.
The minimum version of Jenkins for running this plugin is 1.580.1, so if you are running an older version and you would like to use this plugin, then you will need to upgrade.
The Jenkins Workflow project maintains a Workflow compatibility document that captures the ongoing status of plugins known to be compatible or incompatible.
Updating Jenkins plugins to be more compatible with the new Workflow system is an ongoing community effort and CloudBees is contributing to the effort by allocating time in development schedules to work on prioritized plugins.
CloudBees Support can assist customers with Workflow problems related to the workflow core and compatible plugins. CloudBees does not provide support for problems with using incompatible plugins with workflow and will not consider plugin incompatibilities as "bugs".