Can login to LiberNMS but cannot load page normally

I install LiberNMS on CentOS 7 and use below software for LiberNMS:

MariaDB 10.3.11
PHP 7.2.13
Nginx 1.12.2

The validate.php report is on the below:

====================================

Component Version
LibreNMS 1.46-40-g8bddfe7
DB Schema 273
PHP 7.2.13
MySQL 10.3.11-MariaDB
RRDTool 1.4.8
SNMP NET-SNMP 5.7.2
====================================

[OK] Composer Version: 1.8.0
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[WARN] You have not added any devices yet.
[FIX]:
You can add a device in the webui or with ./addhost.php
[WARN] Your local git contains modified files, this could prevent automatic updates.
[FIX]:
You can fix this with ./scripts/github-remove
Modified Files:
bootstrap/cache/.gitignore
logs/.gitignore
rrd/.gitignore
storage/app/.gitignore
storage/app/public/.gitignore
storage/debugbar/.gitignore
storage/framework/cache/.gitignore
storage/framework/sessions/.gitignore
storage/framework/testing/.gitignore
storage/framework/views/.gitignore
storage/logs/.gitignore

After success install and config LiberNMS, try to add network to LiberNMS.

LiberNMS show below Screenshot page.

I have try to use Firefox and Chrome is have same issue.

How can I solve the issue.