You may have blocked some default workgroup field, which is causing this to happen. Check in the Administrator Console whether the Template being used to create the new SC or Incidents using Service Pages doesn't have any default Workgroup assigned to them.
Hope this helps,
Modesty is good!! But remember, all your life other people will try and take your achievements away from you, don't make it easy for them.
There is a hotfix that must be installed for SP13 which is specific for this error that shows up. I have attached it for you just place it in the on the server and client in the lib directory it will tell you to replace an existing hotfix.jar file which is 1kb with this one which is 7kb...
Well thax for sending me the hotfix.jar file but I already have replaced before..and even than it was showing me the same result..I hope this is some known bug for service pages...also hotfix.jar is used for GUI bugs(if I am not wrong)..
pls suggest as what should I do to solve the problem