Unable to start Couchbase after intallation

Hi,

I am new to Couchbase, and i installed in a new EC2 instance. Once i have completed my installation i am getting this error,

[root@*******~]# /etc/init.d/couchbase-server start
Starting couchbase-servercould not open session
[FAILED]

I searched out in net for this error but am not getting any information about this issue? Can anyone help me out if this issue?

Thanks in Advance,
Alwin