Your assets have different symbols between Oanda and the default (FXCM?).

Do this in your history folder:

* Close Zorro.
* Rename AssetsFix.csv to AssetsFix_backup.csv
* Make a copy of AssetsOanda.csv and name the copy AssetsFix.csv
* Open Zorro and try again.

See also this:
http://zorro-trader.com/manual/en/account.htm

And this:
http://zorro-trader.com/manual/en/zsystems.htm

... and the rest of the manual too. It's all good.