Site Is Down; Error 500; Coding Error? Help?

My site is down and my host tried some troubleshooting and stated:

'Sure thing, the server results with error 500 however there are no visible errors and everything is working as expected , the account is not using that much resources so this is not what is causing the issue, most likely something in the coding is generating this"

They also included error log, if that's helpful- see below. *

How do I resolve this to get my site up and running again as soon as possible?

Thank you. 

And these are the results of the server error log 023-08-23 02:50:16 UTC [apache][core:info] [pid 28323] [client 74.125.212.70:12148] AH00128: File does not exist: /home/u2185-ldvzdqfsm2cl/www/alisonstumpfphotography.com/public_html/blog/feed/ ? 2023-08-23 02:47:42 UTC [apache][core:info] [pid 36294] [client 87.118.135.129:12148] AH00128: File does not exist: /home/u2185-ldvzdqfsm2cl/www/alisonstumpfphotography.com/public_html/favicon.ico, referer: https://www.alisonstumpfphotography.com/?nocache ? 2023-08-23 02:47:13 UTC [apache][core:info] [pid 32026] [client 87.118.135.129:12148] AH00128: File does not exist: /home/u2185-ldvzdqfsm2cl/www/alisonstumpfphotography.com/public_html/favicon.ico, referer: http://www.alisonstumpfphotography.com/ ? 2023-08-23 02:45:07 UTC [apache][core:info] [pid 38068] [client 87.118.135.129:12148] AH00128: File does not exist: /home/u2185-ldvzdqfsm2cl/www/alisonstumpfphotography.com/public_html/favicon.ico, referer: https://alisonstumpfphotography.com/

All those errors are saying is it can't find a favicon icon.

It could be your host updated the PHP version on your hosting and your version of Sytist is not compatible with it. If they updated PHP to 8 (the programming language) then your version of Sytist is not compatible with PHP 8.

If that is the case then you either need to have the PHP downgraded or update your Sytist.

Current Version: 4.6.0

How to update.