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UMG ,i make a new wideget blueprint ,after some operation ,the ue4 editor crash

this is the log.

!Name:Administrator

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

Assertion failed: false [File:E:\ue\UE4.4.3\UnrealEngine-4.4.3-release\Engine\Source\Runtime\UMG\Private\Components\Widget.cpp] [Line: 318]

KERNELBASE + 40541 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 691 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:113]
UE4Editor_Core!FMsg::Logf__VA() + 570 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\core\private\misc\outputdevice.cpp:547]
UE4Editor_Core!FDebug::AssertFailed() + 1232 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\core\private\misc\outputdevice.cpp:203]
UE4Editor_UMG!UWidget::ConvertSerializedVisibilityToRuntime() + 65 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\umg\private\components\widget.cpp:308]
UE4Editor_UMG!UWidget::ConvertVisibility() + 80 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\umg\public\components\widget.h:227]
UE4Editor_UMG!TBaseUObjectMethodDelegateInstance_RetVal_NoParams_OneVar_Const<UWidget,EVisibility,TAttribute<enum ESlateVisibility::Type> >::Execute() + 246 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\core\public\delegates\delegateinstancesimpl.inl:521]
UE4Editor_SlateCore!ComputeDesiredSizeForBox<1>() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\sboxpanel.cpp:212]
UE4Editor_SlateCore!SBoxPanel::ComputeDesiredSize() + 60 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\sboxpanel.cpp:290]
UE4Editor_SlateCore!SWidget::CacheDesiredSize() + 23 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:285]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_SlateCore!SWidget::SlatePrepass() + 151 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:273]
UE4Editor_UMGEditor!SDesignerView::UpdatePreviewWidget() + 217 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\editor\umgeditor\private\designer\sdesignerview.cpp:908]
UE4Editor_UMGEditor!SDesignerView::Tick() + 80 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\editor\umgeditor\private\designer\sdesignerview.cpp:949]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 50 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:249]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_SlateCore!SWidget::TickWidgetsRecursively() + 194 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slatecore\private\widgets\swidget.cpp:253]
UE4Editor_Slate!FSlateApplication::TickWindowAndChildren() + 1021 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:561]
UE4Editor_Slate!FSlateApplication::TickWindowAndChildren() + 1301 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:566]
UE4Editor_Slate!FSlateApplication::Tick() + 2313 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:894]
UE4Editor!FEngineLoop::Tick() + 3397 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\launch\private\launchengineloop.cpp:2115]
UE4Editor!GuardedMain() + 476 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\launch\private\launch.cpp:133]
UE4Editor!GuardedMainWrapper() + 26 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
UE4Editor!WinMain() + 249 bytes [e:\ue\ue4.4.3\unrealengine-4.4.3-release\engine\source\runtime\launch\private\windows\launchwindows.cpp:201]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]


when i try to open my widget blueprint,it always has the same log.
when i double click the file and try to open the code ,and find it just a check(false) function.

so how can i open my widget and edit the widget now??
please help?

this is the second time i make a new project and try a again with the same steps.

Hello,
at first step, did you activate umg in the editor preference of your new project ? If yes then you would better ask for help on answerhub than forum.

thanks

yes,i have already activated the umg in the editor.

until now ,it crashes many times,and when i try to open the Widget Blueprint file again,it never open correctly,cause it crashes again and again.

i have no idea but save the project copy again and again.