[iPrivate]

Remove

pawn Code:

ShowPlayerDialog(playerid, DIALOG_CLASS, DIALOG_STYLE_LIST, "Choose class","MILITARY\nCIVIL", "Choose", "");

from the Register dialog and put it under OnPlayerRequestClass. Conclusion:

pawn Code:

public OnPlayerRequestClass(playerid, classid)
{
       ShowPlayerDialog(playerid, DIALOG_CLASS, DIALOG_STYLE_LIST, "Choose class","MILITARY\nCIVIL", "Choose", "");
       return 1;
}