Unable to SSH in to ASA with new created user

Question

Hello. I have an ASA 5510 firewall running an older verison of code. I"m trying to create a new user account to log in but I can't seem to SSH with this account. ASDM works fine but SSH fails. I thought the command would have been: 
username newuser password usertest123 privilege 15
But I can't SSH with this. What am I missing?
Cisco Adaptive Security Appliance Software Version 7.2(4)
Device Manager Version 5.2(4)

Answer 1

I think this may be what's missing. Here's the error I received though when trying to add this to the configuration. I'm assuming I need to create this group?
FIrewall-ASA(config)# aaa authentication ssh console local
ERROR: aaa-server group local does not exist
Usage: [no] aaa mac-exempt match <mac-list-id>
        [no] aaa authentication secure-http-client
        [no] aaa authentication listener http|https <if_name> [port <port>] [redirect]
        [no] aaa authentication|authorization|accounting include|exclude <svc>
                <if_name> <l_ip> <l_mask> [<f_ip> <f_mask>] <server_tag>
        [no] aaa authentication serial|telnet|ssh|http|enable console
                <server_tag> [LOCAL]
        [no] aaa accounting telnet|ssh|serial|enable console <server_tag>
        [no] aaa authentication|authorization|accounting match
                <access_list_name> <if_name> <server_tag>
        [no] aaa authorization command {LOCAL | <tacacs_server_tag> [LOCAL]}
        [no] aaa accounting command {privilege <level>} <tacacs_server_tag>
        [no] aaa proxy-limit <proxy limit> | disable
        [no] aaa local authentication attempts max-fail <fail-attempts>
        clear configure aaa
        clear aaa local user {fail-attempts|lockout} {all | username <uname>}}
        show running-config [all] aaa [authentication|authorization|accounting
                |max-exempt|proxy-limit]
        show aaa local user [lockout]