Error: Read-only file system
Re: Error: Read-only file system
It means exactly what it says: you've specified complete/incomplete directory path that resides on filesystem that is mounted read-only. Check the output of `mount` to confirm. If this is not expected, it could be that your operating system re-mounted it from read-write to read-only because of filesystem corruption or some hardware error; check the syslog and output of `dmesg` if that's the case.