java.lang.NumberFormatException: For input string: "null" Group with invalid members in WebCT CE 6.0.
 
 
HelpInfo
Group with invalid members in WebCT CE 6.0.
Cause of Problem

The problem occurs if group membership is allotted to members who are not part of the course.
Solution Summary

Login to WebCT. Open the 'Course Content Home' screen. Click the 'Teach' tab. Click 'Group Manager'. Select the required check box associated with the group. To remove members of the selected group, click the 'Remove All Members' button.
Solution Details

Group Manager is used to create and manage groups in WebCT. Management operations, such as delete groups and remove members are performed with the Group Manager tool. Groups enables students and faculty to interact with each other and discuss all the aspects of course.
To remove all members from a group:
1) Login to WebCT.
2) Open the 'Course Content Home' screen.
3) Click the 'Teach' tab.
4) From the 'Instructor Tools' menu, click 'Group Manager'. (The 'Group details' screen appears.)
5) To delete a group, select the check box associated with the group.
6) To remove members of the selected group, click the 'Remove All Members' button. (A confirming message appears.)
  NOTE: To delete the selected group, click the 'Delete' button.
7) Click 'OK'.
Applies to Software Version

WebCT 6.0