There are many ways to increase open files limit to unlimited:
I have just given two ways below.
1. Login as root
take /etc/system file backup
edit /etc/system file
include rlim_fd_max and rlim_fd_cur in /etc/system file to the value ‘unlimited’
set rlim_fd_max = “unlimited”
and
set rlim_fd_cur = “unlimited”
reboot the server.
2. And Second one without rebooting the server.
Add "ulimit -n unlimited" line to ~/.profile or ~/.project file with root login.
Logout and login with user_ID to check.