Profit factor is gross profit divided by gross loss across a set of trades. A value above 1 means the wins outweighed the losses; below 1 means they did not. It summarizes the reward-to-risk balance of a strategy in a single number, though it can be skewed by a few unusually large trades.
The app files could not be fetched. This is usually a network hiccup or an out-of-date cached copy of the site.