"num parameter is required" error when adding a workflow step to a job

[grepjuice]

Hi,
I get a "num parameter is required" error when creating a new job -> Add workflow step -> Command/Script/Script file or URL
Local Command and Job Reference work.

Rundeck version 1.5.3.
This is the error in the log:
2013-06-07 11:31:57,229 [1341100315@qtp-179274584-79] ERROR grails.app.controller.rundeck.controllers.WorkflowController - num parameter is required

Let me know what other info is needed.
Thanks,

[gschueler]

found the issue: javascript bug occurs if you click the step type description, instead of the step type name.

[ahonor]

Verified.