When I was doing the Rilas tutorial on Cloud9, I said, "Not enough space! 』\ A warning came out.
This is because logs are recorded during "rails server" and "raila test" and the data is overwhelmed.
The solution is to empty the contents of "development.log" and "test.log" in the log folder shown in the figure.
If you keep increasing the log data, even the terminal will not work, so it is better to organize the log data regularly.