Couchbase server almost down

Hello,
I’m new to couchbase i installed couchbase server on Mac OS but when i run it i get Servers down:1
and when i navigate to server nodes i get that the server status is “pend”.
I tried to remove couchbase folder from “Application Support” and tried again & again but every time i get the same error.
please if you can help me with that issue.
Regards.