Hi, I recently had reinstalled zenphoto after wanting to try other image galleries, and not finding anything that had what I wanted, upon trying to reinstall it, my error_log file is filled with the same error:

[01-Sep-2021 00:05:30 UTC] PHP Fatal error:  Uncaught Error: Call to a member function getCode() on int in /home/username/public_html/gallery/zp-core/functions-common.php:27
Stack trace:
#0 [internal function]: zpErrorHandler(2, 'filesize(): sta...', '/home/aeswerec/...', 1333)
#1 /home/username/public_html/gallery/zp-core/functions-basic.php(1333): filesize('/home/username/...')
#2 /home/username/public_html/gallery/zp-core/functions-common.php(420): debugLog('EXCEPTION (0): ...')
#3 /home/username/public_html/gallery/zp-core/functions-common.php(54): debugLogBacktrace('EXCEPTION (0): ...', -1)
#4 [internal function]: zpErrorHandler(1)
#5 {main}
   thrown in /home/username/public_html/gallery/zp-core/functions-common.php on line 27

Which I believe is also causing the issue of a white page with nothing on it. At first with a status 500 error, and now I get a 200/302 but still the same white page. As well as the favicon. I have also never had this issue before.

Edit: Apparently the issue was caused from PHP 8.0. Changing back to 7.3 displays pages as normal. No idea why it does that.

You got it right. Zenphoto does not yet support PHP 8.0

Yes, which is documented on our install and requirements page. PHP 8 support is coming soon.