There are a lot of warnings “undefined array key” on it, which I just recently saw. I’ve made no changes on it, only updated WP core and any plugin automatically (therefore I cannot reproduce when this started).
All versions (WP, GP, GPpremium) are up-to-date… I don’t see the error and therefore not a solution!
as requested switched I back from child theme “Mantle” to GP -> 1 error remains -> caused by Plugin ProfilePress -> I deactivated plugin -> no more error
Afterwards I switched back to “Mantle” -> many errors -> so it’s the child theme
There are two types of error:
– css-output.php
– generate-menu-plus.php
I switched back to GP, so I don’t have to deal with these errors. Perhaps you want to take care of them within “Mantle”…?!