Is there a current outage as one of our app is displaying an error but another one of our apps is still running just fine?
The IDE seems to load up ok but I cannot run a debug session either as it comes up with the same error
I have tried restarting the browser, and also different apps.
All my sites and debugger session are running.
Could be site specific.
Looks like this has resolved itself after a complete reboot and some disk clean up - I suspect this was something to do with a hard drive that was completely full 
Sorry but I had to 
import shutil
import os
def low_disk_space_alert(threshold_percentage=10) -> bool:
disk_usage = shutil.disk_usage(os.path.abspath(os.getcwd()))
return (disk_usage.free / disk_usage.total) * 100 < threshold_percentage