This option is used to check for errors in the selected Form. Kushal shows a confirmation message when no compilation or syntax errors are found. However, if any compilation or syntax error is found during this phase, Kushal shows it in a table where the specific error is shown along with the method name. It also considers custom code which is written using Expression Editor while attempting to compile the Form. When you compile each Form individually by using the Check Error button, it shows all errors of the selected Form. If errors are found during code generating phase, errors are grouped Form-wise.
This option shows the errors found during the last compile attempt. Errors may be found either by compiling each individual Form or can be seen all at once by clicking on the generating code button. This helps you to solve errors without having to compile over and over again.