[Ace67]

Im getting an error, i did the locking base for 20 seconds of end round for VIP but getting this error tried to find an const/include didn't find it

//// basebuilder54.sma
// C:\Program Files (x86)\Steam\steamapps\common\Half-Life\czero\addons\amxmodx\scripting\basebuild er54.sma(1025) : error 017: undefined symbol "get_gamerules_round_end_time"

PHP Code:

public cmdLockBlock(id)
{
    new ent, bodypart
    get_user_aiming (id,ent,bodypart)
    
    new tname[7], cname[10];
    entity_get_string(ent, EV_SZ_targetname, tname, 6);
    entity_get_string(ent, EV_SZ_classname, cname, 9);
    
    // Only allow VIPs to lock base during last 20 seconds of the round
    if (get_gamerules_round_end_time() - get_gametime() <= 20)
    {
        if (!access(id, ADMIN_VOTE))
        {
            client_print(id, print_chat, "Only VIPs can lock the base during the last 20 seconds of the round.");
            return PLUGIN_HANDLED;
        }
    }
    // Admins can lock the base any time
    else if (!access(id, LOCK_BLOCKS))
    {
        return PLUGIN_HANDLED;
    }
    
    if (!ent || !is_valid_ent(ent) || is_user_alive(ent) || ent == g_iEntBarrier || !equal(cname, "func_wall") || equal(tname, "ignore")) return PLUGIN_HANDLED
    
    if (!IsBlockLocked(ent) && !g_MovingEnt[ent])
    {
        LockBlock(ent)
        DispatchKeyValue(ent, "rendermode", "1");
        DispatchKeyValue(ent, "rendercolor", "125.0 0.0 0.0");
        
        g_OwnedEnts[g_EntOwner[ent]]--
        g_EntOwner[ent] = 0
    }
    else if (IsBlockLocked(ent))
    {
        UnlockBlock(ent)
        DispatchKeyValue(ent, "rendermode", "0");
    }
    return PLUGIN_HANDLED
}