Thanks Michael, I set displayDebuggingData=0. It's work fine.
I have another problem concerning the question in Moodle. The question is displayed correctly in Webwork (render and display). But can't display some parts of question in Moodle like equation. See the images.
WeBWorK Main Forum
question regarding Opaque server (Moodle -- WeBWorK)
This forum has a limit to the number of forum postings you can make in a given time period - this is currently set at 10 posting(s) in 1 day
