Add node and rebalance

what is wrong with this this i need to add node to my cluster named first the only node which is exist is and i need to another two nodes

C:\Program Files\Couchbase\Server\bin>couchbase-cli server-add -c --username aya --password 123–server-add --server-add-username aya --server-add-password 123

ERROR: Prepare join failed. Failed to establish TLS connection to Please check that you are connecting to a TLS / HTTPS endpoint.

the same happen when i try to add node from workbench when i modified to http

ERROR: Prepare join failed. Joining node to itself is not allowed.