Error Message
Invalid response from server. Check console for details
This message appears to me when I try to open any of my site files and suddenly I could edit now I can not and this message shows me what is the solution?
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Try closing everything and reopening the file manager.
ALTHOUGH, it is important to note that the file manager isn’t designed to edit site files. Ideally, you should make the edits on your computer and upload the file either through the file manager or an FTP client like Filezilla