# Fatal error when launch on 4.14.3

**URL:** <https://forums.unrealengine.com/t/fatal-error-when-launch-on-4-14-3/382538>\
**Category:** Platform & Builds\
**Tags:** editor-crash-on-laun, child-actor-componen, fatal-error, UE4-14, unreal-engine, question\
**Created:** [January 21, 2017, 10:57am UTC](https://forums.unrealengine.com/t/fatal-error-when-launch-on-4-14-3/382538 "2017-01-21T10:57:35Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![FastD](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@FastD](https://forums.unrealengine.com/u/FastD)\
**Post date:** [January 21, 2017, 10:57am UTC](https://forums.unrealengine.com/t/fatal-error-when-launch-on-4-14-3/382538/1 "2017-01-21T10:57:35Z")

</div>

I have a error when i launch editor (screenshot is attached). In this blueprint i have a child actor component. And joke is when i launch editor without blueprint ( in screenshot) and add manualy when editor is open, all work fine without any error like this. I try search and all i found is a try create new project and add all content to a new project, but it did not work.

Is it a bug or its my mistake ?

![123031-ue4+cast+error.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/7/5/7751dc6cc9f3b30f0be9b6139e890c1c1f4a738e.png)

---

<div class="post-metadata">

**Author:** ![anonymous\_user\_b666e59e](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_b666e59e](https://forums.unrealengine.com/u/anonymous_user_b666e59e)\
**Post date:** [January 24, 2017, 2:18pm UTC](https://forums.unrealengine.com/t/fatal-error-when-launch-on-4-14-3/382538/2 "2017-01-24T14:18:27Z")

</div>

Hi FastD,

If you are using 4.14, there is a known issue with ChildActorComponents being cast to a parent that can result in a fatal error like the one you described ([UE-39323](https://jira.it.epicgames.net/browse/UE-39323)). This was fixed for 4.15.

If you are using the Master branch on GitHub, could you provide some additional information about how you are setting this up so I can try to reproduce the error myself?