Error Screen Timer < how to fix

[moidy1]

hay i have error screen timer see pic




and this line in photo

some line form

VVV
VV
V
public void Sceen_thread(object jjjhh, System.Timers.ElapsedEventArgs arg)
{
try
{
if (Owner.Alive)
{

try
{
while (OnAdd.Count != 0)
Objects.Add(OnAdd.Dequeue());

non help lol

what please any one help me