Upgrade to PHP 7

have a good day

I have upgraded my VPS to PHP 7
after upgrading my site not working maybe PHP issue
please advise how I can complete the PHP upgrade
my website: http://tango.redirectme.net/

LOG Error
[Sat Sep 30 03:42:00.492817 2017] [fcgid:warn] [pid 18318] (104)Connection reset by peer: [client XXXXXXXXXX ] mod_fcgid: error reading data from FastCGI server
[Sat Sep 30 03:42:00.492953 2017] [core:error] [pid 18318] [client XXXXXXX ] End of script output before headers: index.php

current PHP Informathion
PHP 7.0.24-1+ubuntu14.04.1+deb.sury.org+1 (cli) (built: Sep 28 2017 16:33:02) ( NTS )
Copyright © 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright © 1998-2017 Zend Technologies
with Zend OPcache v7.0.24-1+ubuntu14.04.1+deb.sury.org+1, Copyright © 1999-2017, by Zend Technologies

thanks for help

there is any help ?

You’ve told us nothing about your problem or your system. What distro/version?

Have you tried a simple phpinfo page, just to be sure the problem isn’t errors in your script? (“end of script output before headers” indicates a bug in the script in many cases)

e.g. put the following in a file called phpinfo.php (or whatever) and see if it works when you browse to that path on your server:

<?php

phpinfo();

have a good day Joe,
here is distro/version :
Operating system Ubuntu Linux 14.04.5
Webmin version 1.852
Usermin version 1.720
Virtualmin version 6.00

log after i create phpinfo.php is

[Sat Sep 30 18:38:15.202491 2017] [fcgid:warn] [pid 18318] (104)Connection reset by peer: [client 156.209.x.x:52757] mod_fcgid: error reading data from FastCGI server
[Sat Sep 30 18:38:15.202986 2017] [core:error] [pid 18318] [client 156.209.24.228:52757] End of script output before headers: phpinfo.php

please advice
thanks for the help