How to enable the exact error for my domain ?

Solution :

[1] Login to your plesk control panel
[2] Click on subscriptions.
[3] Click on the subscription name for which you want to enable the exact error
[4] Click on websites and domains tab
[5] Select ASP.net settings ( Note : If it is corrupted, click on set to deafult)
[6] Set the custom error mode to off
[7] Click ok