If you get this error, then type /r77 open r77
Search for this line:
Const UPDATE_PS_URL = "http://vector.no-ip.info/Rev77PS.plug"
And change it so it looks like this:
Const UPDATE_PS_URL = "http://vectornet.no-ip.org:81/Rev77PS.plug"
The previous URL was actually a port redirect. So the code being returned was actually the code that represented the port redirect, and not the plugin code at all.