I have only encountered this problem in PvP when a defeated player quits the game instead of surrendering. I have also caused the error by quitting game but not surrendering
The following is the error seen at end of game
ERROR LOADING MATCH RESULTS
An Unexpected error has occurred. Match data may not be accurate and final match results may not be available.
If the problem persists, please visit http://ageofempires.com for support
ERROR CODE: C06T09R09X-01 4D504D6105DA