I think the OrderModify and OrderSend errors are being caused due to the fact that the EA opens several positions close to one another at any given point in time, also putting in new buys and sell stops. Particularly you'll see it on other pairs that carry a wider spread than just 2, like GBP/USD.
I found this today:
ordermodify error 130 - MQL4 forum
I'm not a programmer, but it would make sense this being the case. I really wish I was, because Ive got a lot of good ideas for this ea.
Here's more:
Always price error - MQL4 forum
Could have something to do with the bid/ask criteria and the way the ea calls to lock in price/trail, etc.....just my guess.