How to properly clear custom asset reference when close custom asset editor?

Development Pipeline & Plugins Plugins
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1

Hello, I’m developing my own touch interface system and I’m using Slate to edit my custom asset with custom editor. Everything works for the moment as I wish, my custom asset is open, modified and saved without problem in my custom editor.

The problem is that my custom asset is still referenced in memory when I close the custom editor and if I want to open my custom editor again (with a double click on the asset for example), I get the following error and the custom asset editor does not open :

=== Handled ensure: ===
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           Ensure condition failed: ToolkitHost.IsValid() [File:D:/Build/++UE4/Sync/Engine/Source/Editor/UnrealEd/Private/Toolkits/BaseToolkit.cpp] [Line: 130]
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           Stack: 
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe99e26849 UE4Editor-UnrealEd.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe99a64afc UE4Editor-UnrealEd.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe99a061a5 UE4Editor-UnrealEd.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe99a1f44c UE4Editor-UnrealEd.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d58fe7 UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d1688f UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d622ad UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d1461d UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d11037 UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d74077 UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe83d6271b UE4Editor-ContentBrowser.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe9b550f9e UE4Editor-Slate.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe9b5d53e2 UE4Editor-Slate.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe9b5be68a UE4Editor-Slate.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffe9b5b1ad9 UE4Editor-Slate.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffebcd27f62 UE4Editor-ApplicationCore.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffebcd15c87 UE4Editor-ApplicationCore.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffebcd2a619 UE4Editor-ApplicationCore.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffebcd117d0 UE4Editor-ApplicationCore.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007fff1820e858 USER32.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007fff1820e299 USER32.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ffebcd2bb34 UE4Editor-ApplicationCore.dll!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ff7ea0168c4 UE4Editor.exe!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ff7ea02ba7c UE4Editor.exe!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ff7ea02bb5a UE4Editor.exe!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ff7ea03e31d UE4Editor.exe!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007ff7ea04145a UE4Editor.exe!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007fff18c77034 KERNEL32.DLL!UnknownFunction []
Tue Mar 29 12:09:51 CEST 2022 Error        LogOutputDevice           [Callstack] 0x00007fff198e2651 ntdll.dll!UnknownFunction []

Has anyone ever encountered this error when designing a plugin? Do you think this error is related to the asset which is still referenced in memory?

2

Problem solved! It was not related to my custom asset but to my custom editor. In one of my widgets, I had a variable that referred to my custom editor and it was of type TSharedPtr instead of TWeakPtr which was causing the reopening issue.