[L.Hudson]

add above public OnDialog(playerid, dialogid, response, listitem, inputtext[])

pawn Код:

forward OnDialog(playerid, dialogid, response, listitem, inputtext[])

it should look like this

pawn Код:

forward OnDialog(playerid, dialogid, response, listitem, inputtext[])
public OnDialog(playerid, dialogid, response, listitem, inputtext[])