I made a course with a modified master slide with Courselab2.4 and after viewing module or publishing I am getting a message box after I clicked on "Start Module" I got an Information box.
That is showing "Callmethod:003_textbox Constuctor'g_oSlideFrame' is null or not an object."

After clicking "Ok" it is running fine.
Tell me what I should do to overcome the problem.  

Hi, Anirban,

This alert means that Textbox object is trying to create itself before the current slide is created. Perhaps you are using textbox object on the master-slide and some actions associated with it?