1. Login sample database, try to create a UDF and Validation Rules for the customers object. 2. Logout and login to live database, go to customers account maintenance, then all the records are empty 3. Close the screen, the system prompted error “Value cannot be null, Parameter name: obj”
It will only happen if we logout and login immediately, so, after we create the UDF or Validation Rules, it is advisable to
close the application then start the application again, then this problem will not be happen.