custom.css has stopped working work on london template.
All of the scripts I typed in there has disappeared, every time I type something into it I get an error message saying that "the css/custom.css could not be saved". A warning alert also came up saying that "could not save data"
I also can't update to Joomla 3.7.5 as it also produces an error message.
I have also lost all of the data I had on the file and I am unable to write and save any code too. Can you please advise me. Thank you very much.