Logi? Inne klasy działają? Wrzuciłeś codclass_partyzant.amxx do folderu plugins?
L 10/30/2017 - 19:27:54: Start of error session.
L 10/30/2017 - 19:27:54: Info (map "de_dust2") (file "addons/amxmodx/logs/error_20171030.log")
L 10/30/2017 - 19:27:54: [AMXX] Invalid Plugin (plugin "codclass_partyzant.amxx")
L 10/30/2017 - 19:28:04: Start of error session.
L 10/30/2017 - 19:28:04: Info (map "de_dust2") (file "addons/amxmodx/logs/error_20171030.log")
L 10/30/2017 - 19:28:04: [AMXX] Invalid Plugin (plugin "codclass_partyzant.amxx")
L 10/30/2017 - 19:28:08: Start of error session.
L 10/30/2017 - 19:28:08: Info (map "de_dust2") (file "addons/amxmodx/logs/error_20171030.log")
L 10/30/2017 - 19:28:08: [AMXX] Invalid Plugin (plugin "codclass_partyzant.amxx")
L 10/30/2017 - 19:53:07: Start of error session.
L 10/30/2017 - 19:53:07: Info (map "de_airstrip") (file "addons/amxmodx/logs/error_20171030.log")
L 10/30/2017 - 19:53:07: [AMXX] Invalid Plugin (plugin "codclass_partyzant.amxx")
L 10/30/2017 - 20:18:06: Start of error session.
L 10/30/2017 - 20:18:06: Info (map "cs_havana") (file "addons/amxmodx/logs/error_20171030.log")
L 10/30/2017 - 20:18:06: [AMXX] Invalid Plugin (plugin "codclass_partyzant.amxx")
L 10/30/2017 - 20:39:12: Start of error session.
L 10/30/2017 - 20:39:12: Info (map "de_dust2") (file "addons/amxmodx/logs/error_20171030.log")
L 10/30/2017 - 20:39:12: [AMXX] Invalid Plugin (plugin "codclass_partyzant.amxx")
Podstawowe klasy działają.. pisałem wyżej podeslalem tez plugins ;f czytaj, czytaj