Chartboost RTB error 502: Bid won the auction but the ad failed to load
What Chartboost says
The bid won, then the ad failed to load. Chartboost reports that as 502.
Chartboost reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Chartboost RTB error 502 is this code.
What to change
The auction price was fine. Fix the creative load. A win notice can still fire for this bid.