it looks like your editor for some reason went out of sync with what is present in the filesystem. This typically happens if you edit a file from the console, or if a process modifies your files. Right now we don’t support editing files that change outside of the editor.
To restore your editor, you can go to the console (Project Menu -> Advanced Options -> Open Console) and run the
refresh command. It will reset the state of your editor so that you should be able to keep editing from there.
Another possible reason is that your project is out of disk space. In this case, changes you make in the editor can’t be saved in the backend. Make sure you’ve got enough space and try removing packages or other files to make more space.