I have been getting this error with the plugin for a while which happens with CS:S, DoD:S, FF, and TF2, so it doesn't appear to be specific to the game nor does it seem to affect anything negatively. Just an FYI.
Code:
L 10/22/2007 - 10:54:57: SourceMod error session started
L 10/22/2007 - 10:54:57: Info (map "cp_well") (file "errors_20071022.log")
L 10/22/2007 - 10:54:57: [SM] Native "GetClientTeam" reported: Client 7 is not in game
L 10/22/2007 - 10:54:57: [SM] Debug mode is not enabled for "swear_replacement.smx"
L 10/22/2007 - 10:54:57: [SM] To enable debug mode, edit plugin_settings.cfg, or type: sm plugins debug 16 on
L 10/22/2007 - 11:25:07: Error log file session closed.