No value given for outbound proxy on line 0 of sip.conf

Hello Community,
Under several versions of asterisk 1.8, until the last which I have in production v. 1.8.5 I see in my cli the following warring:

Meanwhile in sip.conf line 0, I don’t have nothing, line 0 it’s 0, and line 1, I have [general]…

What’s this message in the earth may mean??

Thanks in advance,