Error when creating a site collection with SharePoint 2013

Currently, I have 1 server 221 for WebFrontEnd, 1 server 222 for WebBackEnd.

1. After I created a new web application with port 90 in the server 221, I tried to create a site collection but I got into a problem as picture 1.


2. Then, I tried to create a site collection in the server 222, yet it got another issue as picture 2.

What I have done here is that I have tried to modify the CustomErrors mode from Off to RemoteOnly. However, for 2 servers and all paths below, I only got CustomErrors mode with On.

1. C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\TEMPLATE\LAYOUTS\web.config


2. C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\TEMPLATE\ADMIN\web.config


3. C:\inetpub\wwwroot\wss\VirtualDirectories\90

Please let me know how to address the problem.

Picture 1:

Picture 2: