Cannot start Appium servers

When I try to start appium on and port 4723 It gives me the below error.

<![CDATA[Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure. Build info: version: '2.51.0', revision: '1af067d', time: '2016-02-05 19:15:17' System info: host: 'distiller-build-5.local', ip: '', 'Mac OS X', os.arch: 'x86_64', os.version: '10.11.3', java.version: '1.8.0_60' Can you guys please help me with this situation. Thanks Kranthi

Resolved this issue by using the below command in Circle.yml

-appium :

    background : true

Could you please share your config.yml file?