This error message usually occurs when there is an issue with your broker.
What is your account size?
Try to place a small trade manually, such as 0.01 lots, to see if your broker will accept this trade. You can then close the trade.
If you can place a small manual trade then try a small lot size with the EA.
If you still cannot place a trade contact your broker on why you are not able to place a trade.
Alan,