If this is the first time you've received this error, please try that activity again and resume what you were doing before the error occurred. If you encounter the issue a second time, please exit Destiny and relaunch the game.
If you are seeing this error message after checking our @BungieHelp twitter and the Bungie.net forums for any updates, and have exhausted all troubleshooting resources, then please delete and re-install Destiny on your console.
If you re-install and still have this issue, please start a new topic on the #Help forum and let us know which error code you received, what platform you are playing on, and what you were doing when it occurred.