I can't package my project: Null Widget Tree

Development Platform & Builds
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1

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)

2

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

3

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

4

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

5

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.

6

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.

7

My solution:

In case anyone runs into this problem in the future. I had renamed one of my widgets sometime during my project and then got this error during packaging. In Panteonio’s example, try to create a widget in that folder called “screen_master” and see if it lets you. It didn’t for me, saying theres already a file with that name, so I went into the project root folder → content and found a file with the old name was still hanging around. I deleted it and it packaged fine.