懂错误日志的大神请帮我看看 总是在出屋子加载场景时跳出

qsfd6

[07/11/2016 - 02:33:17PM] Error: alias MCSAliasActor30 on quest MCSQuest (71003E5A): Cannot force the alias's reference to a None reference.
stack:
        [alias MCSAliasActor30 on quest MCSQuest (71003E5A)].ReferenceAlias.ForceRefTo() - "<native>" Line ?
        [MCSQuest (71003E5A)].MCSQuestScript.OnUpdate() - "MCSQuestScript.psc" Line 53
[07/11/2016 - 02:33:17PM] Error: alias MCSAliasActor31 on quest MCSQuest (71003E5A): Cannot force the alias's reference to a None reference.
stack:
        [alias MCSAliasActor31 on quest MCSQuest (71003E5A)].ReferenceAlias.ForceRefTo() - "<native>" Line ?
        [MCSQuest (71003E5A)].MCSQuestScript.OnUpdate() - "MCSQuestScript.psc" Line 53

这一段是什么意思呀？？？