null</br></br>x.DinoQException: Error in DataModel: ((CourseDB)) jsonToXDataModel() method for jsonmodel: ((null)) Error Message: (([]))</br></br>Exception thrown from jsonToXDataModel in class x.XSystemDataModel [on line number 940 of file XSystemDataModel.java]</br></br>Exception thrown from getModel in class th.co.skylogicsystem.skyframework.core.datalayer.XData [on line number 242 of file XData.java]</br></br>Exception thrown from run in class AcourseCourse40 [on line number 134 of file AcourseCourse40.java]</br></br>Exception thrown from run in class java.lang.Thread [on line number 840 of file Thread.java]</br></br>