Looks like you might have shut it off.
either type "reboot"
or reboot from the web page.
Then try to have a look again.
The screen -r should have worked. So.... start again may be faster than thinking.
Looks like there is another ssh session with the screen attached already. "screen -rd" will probably do the trick as it detaches the screen session from wherever it is currently running, and then attaches your current session to it.
