Error in loading Scheduler in front end

I am new to dhtmlxScheduler, when I first install the component, it was working fine. Then I start using putting events in the front end - after a while, it display the following errer message:

I also enter the debug mode and it did not return any error.

Please help!

Also, in the backend, all events description written in Chinese can not display properly. Front end display was ok. What can I do about it?

could you provide link to your scheduler page?