[14:13:39 WARN]: [Skript] coloured the 1st argument is already a text, so you should not put it in one (e.g. coloured the 1st argument instead of "%coloured the 1st argument%") (NazywanieItemow (4).sk, line 7: set name of player's tool to "%colored arg%"')
[14:13:39 WARN]: [Skript] coloured the 1st argument is already a text, so you should not put it in one (e.g. coloured the 1st argument instead of "%coloured the 1st argument%") (NazywanieItemow (4).sk, line 17: set lore of player's tool to "%colored arg%"')
To nie jest błąd i nie musisz tego poprawiać, ale aby to zniknęło zamiast "%colored arg%" daj po prostu colored arg
Jeżeli chodzi o gui to zamiast format slot... polecam użyć czegoś takiego:
set slot 10 of player's current inventory to gold block named "&eBlok Zlota"