session limit exceded

The maximum number of simultaneous sessions (1) for your account has been reached. You did not log off from a previous session or someone else is logged on to your account. This may indicate that your account has been compromised or that account sharing is limited on this site. Please contact the site administrator if you suspect your account has been compromised.
Select a session to disconnect.:
Host: (idle: 1 week 1 day)
Host: (idle: 27 sec) Your current session.
please help me to resolve this problem.

This happens if you try to login on 2 devices at the same time. Or may be two browsers. Only solution is that logout from previous session. You can’t login in 2 sessions at the same time.