Unknown Exception Crash Blueprint

Development Programming & Scripting Blueprint
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1

Hey i have this blueprint:

And this callstack:

MachineId:73E991C54E477703B00445BEE2A221F0
EpicAccountId:40dd2988f279471f82aefa4031bd2e82

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: GIsEditor || bCreatingCDO || !InClass->HasAnyClassFlags(CLASS_Abstract) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.

KERNELBASE + 24684 bytes
UE4Editor_Core + 3174852 bytes
UE4Editor_Core + 1677512 bytes
UE4Editor_Core + 1566866 bytes
UE4Editor_CoreUObject + 1522712 bytes
UE4Editor_CoreUObject + 1527383 bytes
UE4Editor_UMG + 72840 bytes
UE4Editor_UMG + 449752 bytes
UE4Editor_UMG + 1388906 bytes
UE4Editor_CoreUObject + 549780 bytes
UE4Editor_CoreUObject + 1318750 bytes
UE4Editor_CoreUObject + 1435554 bytes
UE4Editor_CoreUObject + 1572003 bytes
UE4Editor_CoreUObject + 1440718 bytes
UE4Editor_CoreUObject + 1320058 bytes
UE4Editor_CoreUObject + 1577556 bytes
UE4Editor_CoreUObject + 1440718 bytes
UE4Editor_CoreUObject + 549780 bytes
UE4Editor_CoreUObject + 1438659 bytes
UE4Editor_Engine + 1818193 bytes
UE4Editor_Engine + 9871675 bytes
UE4Editor_Engine + 3769504 bytes
UE4Editor_Engine + 3873565 bytes
UE4Editor_Engine + 3883827 bytes
UE4Editor_Engine + 9430532 bytes
UE4Editor_Engine + 9213296 bytes
UE4Editor_Engine + 3882838 bytes
UE4Editor_Engine + 3789640 bytes
UE4Editor!FEngineLoop::Init() + 551 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.5\engine\source\runtime\launch\private\launchengineloop.cpp:1853]
UE4Editor!GuardedMain() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.5\engine\source\runtime\launch\private\launch.cpp:128]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.5\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.5\engine\source\runtime\launch\private\windows\launchwindows.cpp:201]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

When i skip the “Create UserWidget Widget” node everything is fine but the mouse is not locked to the viewport.

Any ideas please?

2

Hey Azarus-

I have a few questions to help me understand what’s happening on your end. Do you get the same crash if you include that node on a begin play event in a new project? Does this crash occur when you try to compile the blueprint or when you play the game? Also, which version of the engine are you on? If you can think of any other information related to this crash it could help identify the problem.

Cheers

3

Hey,

I am using the 4.5.1 version.
Also the crash happens when i call the Create UserWidget function. I created a new Widget blueprint and set the class to this one and now it works fine. The crash happened when i tried to launch the game in standalone mode or i packaged it.
Also I was not able to reproduce the crash in this project or in a new one.

4

It sounds like you were able to get your project working and are not having the crash occur anymore. I have logged the crash and callstack in our internal database (UE-6170). Please respond here if this crash comes up again.

Cheers

5

Looks like this fix went into 4.7