Cannot Edit Theme via Wordpress Theme Editor

[adapter12v]

I have a terrible headache to find the problem why i could not using wordpress theme editor to save my changes. it always give a notification "Something went wrong. Your change may not have been saved. Please try again. There is also a chance that you may need to manually fix and upload the file over FTP." anyone has the solution for this kind?

[bytecanarias]

The same thing happens to me but with Divi