Server error while processing page link

[ITechnify]

SYSTEM INFORMATION
OS type and version	REQUIRED

| Webmin version | REQUIRED | 1.990

hello there, been trying to figure this out but i havent been able to… so please excuse my ignorance. the issue i have is as shown:

whenever i try to open the link i get this error...  nginx error while reading response header from upstream error 500 server error log: Stack trace:
#0 /var/www/pc/repair/pc.php(12487): printclaimticket()
#1 {main}
  thrown in /var/www/pcrt/repair/pc.php on line 2919" while reading response header from upstream, client: 104.35.178.220, server: _, request: "GET /pc/repair/pc.php?func=printclaimticket&woid=6362 HTTP/1.1", upstream: "fastcgi://unix:/run/php/php-fpm.sock:", host: "mydomain.com", referrer: "https://mydomain.com/pc/repair/index.php?pcwo=6362"
2022/10/22 20:26:54 [error] 292#292: *917 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Call to undefined function mb_substr() in /var/www/pcrt/repair/pc.php:2919

[stefan1959]

@ITechnify

pcrt

You would be best to email PC Repair Tracker, he would know what the error is all about. I’ve installed for clients with no issue on a Cpanel setup. As long as you edit your deps.php file correctly it should all work. I’ve never install on VM or webmin. I would think VM would be a easier system to run on as it setup your webhosting correctly.

[ITechnify]

hi there and thanks for replying, pc repair tracker is not responding emails or support, idk why. i have edited all deps files and everything is working fine. is just that issue that is driving me kdjfkd.
Still trying to figure this out. thanks

[jimr1]

@ITechnify

mb_substr()

seems like you don’t have the correct php modules
try sudo apt-get install php-mbstring and restart apache

[ITechnify]

thanks so much, it worked.