How to set a custom error page in SAS Studio for concurrent session limit

[vedchd]

We have almost 100 users who are using SAS Studio on their browsers, but a few users open multiple sessions on the browser, and it's creating problems. Now we have already set the user session limit to 2 only.

Limiting the number of sessions in SAS Studio can be achieved by changing the configuration of SAS Studio. The file is located in

• Config\LevX\Web\WebAppServer\SASServer2_1\sas_webapps\sas.sasstudio.war\config
• SASHome\SASStudioMidTier\versionnumber\Static\wars\sas.sasstudio\config

It's already configured, but when we try to open 3 sessions, it's showing the below error and 

An unexpected error occurred. If this problem persists try clearing your browser cookies.

So how do I create a custom error page? Because this error confuses the user, does anyone know how we set the custom error for example (The user session limit is exceeded, and we have only opened two browsers for the Studio session)