No Graph is showing for ports

Hi

We have created new vps and installed libernms and imported the DB from old server.
Now the problem is no graphs showing for the ports.

the output of validate.php is

-bash-4.2$ ./validate.php

Component Version
LibreNMS 1.64.1-255-gcab235c
DB Schema 2020_06_23_00522_alter_availability_perc_column (170)
PHP 7.3.19
Python 3.6.8
MySQL 5.5.65-MariaDB
RRDTool 1.4.8
SNMP NET-SNMP 5.7.2
====================================

[OK] Composer Version: 1.10.8
[OK] Dependencies up-to-date.
[OK] Database connection successful
[FAIL] Time between this server and the mysql database is off
Mysql time 2020-06-27 08:45:05
PHP time 2020-06-27 04:45:05

[OK] Database schema correct

i have shared the screenshot please check it …

Thank you…