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Crash when open level

When I try to open the second level of my game, it crashes on packed game. It works fine when playing in editor.

The log file has this error:

[2017.03.16-00.32.08:509][321]LogWindows:Error: Assertion failed: LocalExportIndex.IsNull() [File:D:\Build\++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp] [Line: 1915]

Opening the file AsyncLoading at line 1915, the assert has this comment: "otherwise we have two exports that match and our criteria is not good enough". I have no idea what it means, but perhaps someone can explain it to me?

Product Version: UE 4.15
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asked Mar 16 '17 at 01:08 PM in Packaging & Deployment

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Marcio Daniel
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2 answers: sort voted first


The issue happened because I had an actor on my level with a component marked with the "IsEditorOnly" flag.

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answered Mar 17 '17 at 03:16 AM

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Marcio Daniel
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Hi Marcio Daniel,

I believe you're running into the following crash, at least based on the error message you've provided:


Could you do me a favor and take a look at that and verify if that's the same issue (check the callstack as well).

If not, let me know and I'll be glad to continue to investigate.

Have a great day

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answered Mar 16 '17 at 02:07 PM

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Sean L ♦♦ STAFF
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avatar image Marcio Daniel Mar 16 '17 at 03:33 PM

I don't think so, Sean. I'm not even using the Leap Motion plugin.

Unfortunately, I didn't have the callstack. Look at my log (see attachment): link text

If there is a way to enable symbols or anything like that to see the callstack, please tell me.

squad51.log (24.7 kB)
avatar image Sean L ♦♦ STAFF Mar 16 '17 at 03:37 PM

Interesting, the error messages are similar so figured it was worth mentioning. Unfortunately the callstack in your log doesn't provide anything that we can go off of.

Is it a shipping build that's crashing for you or a development/debug build?

avatar image Marcio Daniel Mar 16 '17 at 04:03 PM

The build configuration doesn't matter, the issue happen on development/debug/shipping configurations.

But I found a checkbox named "Include Debug Files", so I now have the call stack: link text

(Why is this answer marked as "accepted"? If I did that, it was unintentionally. Is it possible to remove this flag?) (edit: forget about it, it's not marked anymore... weird)

squad51.log (25.5 kB)
avatar image Marcio Daniel Mar 17 '17 at 03:18 AM

Thank you for the help, Sean. I found the solution, it was an "IsEditorOnly" flag that was marked on a component in my level.

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