It was following message attached in file section below that error is seen when i was the cases that I have designed.
This error often can be fixed by the whole system compillation. Try to perform the following steps:
In the system configurations
1.Generate the source code for all items.
2. Update the database structure.
3. Compile all items.
After that, try to add a new case. If it still cannot help, please email us at email@example.com and our support team will take a closer look into the problem in your particular environment.
Thank You Mr. Parrett for your reply