...outside of story manager.
I've been seeing this spammed to my papyrus logs ever since I completed the Companions' Purity quest. Now I do run a lot of mods, but I've seen this reported elsewhere by people running the vanilla game. It seems to be a cause of CTDs and freezes in the game.
Hopefully this can be fixed along with the lip sync bug.
[08/28/2013 - 09:47:00PM] ERROR: CR13 (000E3163): attempting to start event scoped quest outside of story manager.stack: [CR13 (000E3163)].cr13questscript.SetCurrentStageID() - "" Line ? [CR13 (000E3163)].cr13questscript.SetStage() - "Quest.psc" Line 124 [CR13 (000E3163)].companionsradiantquest.Setup() - "CompanionsRadiantQuest.psc" Line 41 [CR13 (000E3163)].cr13questscript.Setup() - "CR13QuestScript.psc" Line 26 [CR13 (000E3163)].QF_CR13_000E3163.Fragment_10() - "QF_CR13_000E3163.psc" Line 57