null</br></br>x.DinoQException: Error in DataModel: ((CourseDB)) jsonToXDataModel() method for jsonmodel: ((null)) Error Message: (([java.base/java.io.StringReader.<init>(Unknown Source), th.co.skylogicsystem.skyframework.core.utils.web.json.JSONTokener.<init>(JSONTokener.java:59), th.co.skylogicsystem.skyframework.core.utils.web.json.JSONObject.<init>(JSONObject.java:285), x.XSystemDataModel.jsonToXDataModel(XSystemDataModel.java:867), th.co.skylogicsystem.skyframework.core.datalayer.XData.getModel(XData.java:243), AcourseCourse41.run(AcourseCourse41.java:136), java.base/java.lang.Thread.run(Unknown Source)]))</br></br>Exception thrown from jsonToXDataModel in class x.XSystemDataModel [on line number 941 of file XSystemDataModel.java]</br></br>Exception thrown from getModel in class th.co.skylogicsystem.skyframework.core.datalayer.XData [on line number 243 of file XData.java]</br></br>Exception thrown from run in class AcourseCourse41 [on line number 136 of file AcourseCourse41.java]</br></br>Exception thrown from run in class java.lang.Thread [on line number -1 of file null]</br></br>