Hi, Mbbt,
Thank you for reporting this, but unfortunately, this product does not support spread-betting accounts, I had a quick look to see if we could do a quick fix and this is not possible as the symbol name is unique to Pepperstone and not industry standard. If on the other hand, more customers start requesting this feature to be added, we will review and update the product.
The error is caused because the broker does not have a symbol called EURUSD_SB on this account.
Did you try adding a new symbol name by typing EURUSD_SB and clicking on the + button?