[System64]

are you logged in as admin or what ever?show SendHelperMessage function
and little cleaner code:

pawn Code:

if(dialogid == DIALOG_HELPME)
{
    if(!response) return 0;
    if(strlen(inputtext) < 8) return SendClientMessage(playerid,COLOR_LIGHTRED, "ERROR: Your message is too short, it must contain at least 8 characters");
    new helpmetext[128];
    Requesting_Help[playerid] = 1;
    format(helpmetext, sizeof(helpmetext),"%s(ID:%i) is requesting help:%s",PlayerName(playerid),playerid,inputtext);
    SendHelperMessage(COLOR_RED, helpmetext);
    SendHelperMessage(COLOR_RED, "Type /ahm to accept his help request.");
    HelperTimer[playerid] = 60;
}