I tried installing wet_quickopen 1.7 but forgot to first install wet_peex which is required for it to function.

In PHP 8.4, Textpattern then throws an error, but it is not specific to the plugin:

8192 "Passing E_USER_ERROR to trigger_error() is deprecated since 8.4, throw an exception or call exit with a string message instead"
in /path/to/site/textpattern/lib/txplib_misc.php at line 1252.

This is indeed noted on php.net and wiki.php.net.

We have a whole load of such situations in the core: see this GitHub repo search.

Additional information

Textpattern version: 4.9-dev

Web server vendor and version: Laravel valet = nginx + php + mysql

PHP version: 8.4.10

Operating system: mac linux