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As you told I have changed "if(dimdim_is_teacher($dimdim))" to "if(dimdim_is_teacher($dimdim))" in "view.php" file available at "\moodle\moodle\mod\dimdim".
Now the problem is any instructor can start the meeting. ButI want to restrict only for that perticular instructor to start the class, who has created that class.