At LMS Plugins, I have installed Airplay Bridge and have the red colored error: Configuration file missing - create one by clicking "generate" or, if autosave is on, refresh this page
Again at LMS the ShairTunes2 (fork) (v0.107.2) Plugin is installed and get this error: 404 Not Found: plugins/Extensions/settings/plugins/ShairTunes2W/settings/basic.html
The latter should not be connected to your AirPlay speakers connection. Can you play via AirPlay to Squeezelite players?
Can you find any further errors aside from this line in the debug?
Also, please try consulting the creator of the plugin, Philippe_44 over slimdevices, I he might have a quicker idea to fix your issue. Here’s the thread