[OMP] Errors compiling

Hello, I tried to compile samp gamemode with open.mp and encountered errors and warning that I can't find anywhere in docs

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys) ------> error 025: function heading differs from prototype
                                                                                                                      warning 213: tag mismatch: expected tag "t_KEY", but found none ("_")

public OnPlayerWeaponShot(playerid, weaponid, hittype, hitid, Float:fX, Float:fY, Float:fZ) ----------> error 025: function heading differs from prototype

GivePlayerWeapon(playerid, 31, 15); ------------------> warning 213: tag mismatch: expected tag "t_WEAPON", but found none ("_")