Hi, I am getting an error that just says the title. I cannot for the life of me figure out how to debug this. I have two copies - a local and a working, on the local copy which is a completely fresh installation, I can create spritesheets and create new named slices, but when I try to edit or delete the named slice nothing happens and just gives the same error.
On the working copy, I cannot create a new spritesheet at all and just get the error. Help!
MW 1.31.0 / PHP 7.2.6