Error Creating Mount Source Path

Hi guys,

currently I’m running docker in Ubuntu 20.04 with portainer as well. The problem is I keep getting this error message when I want to start one container. Any pros here can guide me? thanks

docker: Error response from daemon: error while creating mount source path ‘/docker/mi-connector’: mkdir /docker: read-only file system.

I suspect its the permission problem but I’m not sure.
Please help.
Thanks