I am using 000webhost to host my website. When I leave it on PHP version 7.2, I receive this warning: “Composer detected issues in your platform: Your Composer dependencies require a PHP version “>= 8.0.0”.” However, when I increase the PHP version on the site to 8.0.0, the website doesn’t load and displays the message “Unable to fulfill this request at the moment.” Please help me resolve this issue.
It happes at EloJob and get redirect to https://alexojobs.000webhostapp.com/comprar
Hi! I see no issues with your site, you may want to turn on/off errors rendering from website settings 
Some screenshots may helps as well
Thanks for providing screenshots. Did you try enabling errors in your PHP code to check if you’re able to see any issues that would be causing a 500 error?
How to enable error reporting in php - Tutorials - 000webhost forum
i’m getting this error message, but in my local host everything is working fine,
Fatal error : Uncaught Error: Class “App\Pix\Payload” not found in /storage/ssd3/896/20961896/public_html/comprar.php:25 Stack trace: #0 /storage/ssd3/896/20961896/public_html/index.php(25): include() #1 {main} thrown in /storage/ssd3/896/20961896/public_html/comprar.php on line 25
The absolute most used resource when first starting out when you’ve exhausted yourself with Googling and digging - you can post coding related issues and such on StackOverflow and fellow web devs can assist you in their spare time! 
https://stackoverflow.com
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