no you cannot backtest this EA because it is a multicurrency EA,
But this error is on backtest? If it is on a demo account, please note that f you are using IBFX you need to put the "m" on the end of the pairs like
EURUSD turns EURUSDm
hope this helps
I just read again your post. Thats it you cannot backtest. It only place order for the first pair, the pair you choose on Strategy tester.