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i can't package my project: Null Widget Tree

Please, help me: i can't package my project... Output log errors: UATHelper: Packaging (Windows (64-bit)): LogUMG: Error: PreSave: Null Widget Tree - screen_master_C /Game/comp_anim/screen_master.WidgetArchetype PackagingResults: Error: PreSave: Null Widget Tree - screen_master_C /Game/comp_anim/screen_master.WidgetArchetype UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogUMG: Error: PreSave: Null Widget Tree - screen_master_C /Game/comp_anim/screen_master.WidgetArchetype UATHelper: Packaging (Windows (64-bit)): ERROR: Cook failed. I dont know what does it mean... Guys, please, help me )) Thank you)

Product Version: UE 4.21
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error.txt (171.5 kB)
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asked Mar 08 '19 at 10:36 PM in Packaging & Deployment

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Panteonio
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avatar image Panteonio Mar 08 '19 at 10:37 PM

P.S. Screen master is an widget component in comp_anim blueprint

avatar image benpret May 27 '19 at 10:27 PM

I am having the same issue. But I would prefer not to delete my menu as my game needs it.

UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogUMG: Error: PreSave: Null Widget Tree - MainMenuWidget_C /Game/FirstPersonBP/Blueprints/MainMenuWidget.WidgetArchetype

avatar image dpham Jun 28 '19 at 04:51 PM

I had this problem and fixed it. In my example: PreSave: Null Widget Tree - Expanded_UI_C /Game/UMG/Expanded_Button.WidgetArchetype

The problematic widget is Expanded UI. When I was able to right-click on it and go to reference viewer, I saw that there was an Expanded_Button reference with no value in it, which was causing the build to fail. I'm not even using this Expanded_Button anymore and it does not exist in my content browser, so my guess was I created it one point and when I deleted it, some traces of it were left behind.

I couldn't delete this from the reference viewer unfortunately. I recreated the widget with the same name Expanded_Button and checked the reference viewer again for Expanded_UI widget, and I no longer saw it being referenced. I deleted the Expanded_Button after that and double checked once more from the reference viewer and it was now properly gone.

I assume once it found a proper matching name, it was able to resolve itself with the null value. Hope this helps.

avatar image Sleicreider Jul 01 '19 at 04:58 PM

Did anyone find any other solution to this besides recreating the whole Widget? This seems to have a really strange behavior for packaging, for me the package sometimes fails and sometimes works when I set the property where it is referenced to "None" and back.

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I just deleted it and created it again, everything worked ...

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answered Mar 09 '19 at 11:58 PM

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Panteonio
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