hydrofountain → created an issue. See original summary → .
Just had the exact same problem!
Just checked and the file does not exist.
Is clearing the registry the same thing as clearing cache? If so, still getting the same error after clearing cache.
SOLVED:
Had to change the permission level in cPanel to be 644 and 755 for the folders I was getting the errors on
I have a block on my website with the following code:
<button onclick="toggle_visibility('block-system-main-menu');">
//...
</button>