Same Problem here.
Does someone has a solution?
Help me too!
I am using a demo account for testing.
trying to modify open order by OrderModify() throws error 4109.
Did you do this . . .
and this . .
This problem(4109) is made for me!!!iwent to tools / options but there was no any tab with name of expert advisord .
Do you know the difference between MT4-Terminal and MT4-IDE ?
Oft ist einfach nur das "Autotrading" nicht eingestellt / ausgeschaltet ..