hello, i want to target my project with vulkan but when i deleting any object on map i have this (Screen) ..
and i have this error every time when i delete or when i have most bp open or when i working on material ..

[2019.05.23-03.43.25:057][105]LogWindows: Windows GetLastError: L’opération a réussi. (0)
[2019.05.23-03.43.25:733][105]LogThreadingWindows: Error: Runnable thread RHIThread crashed.
[2019.05.23-03.43.25:733][105]LogWindows: Error: === Critical error: ===
[2019.05.23-03.43.25:733][105]LogWindows: Error:
[2019.05.23-03.43.25:733][105]LogWindows: Error: Fatal error: [File:\Build\++UE4\Sync\Engine\Source\Runtime\VulkanRHI\Private\VulkanUtil.cpp] [Line: 678]
[2019.05.23-03.43.25:734][105]LogWindows: Error: Result failed, VkResult=-4
[2019.05.23-03.43.25:734][105]LogWindows: Error: at D:\Build\++UE4\Sync\Engine\Source\Runtime\VulkanRHI\Private\VulkanMemory.cpp:1853
[2019.05.23-03.43.25:734][105]LogWindows: Error: with error VK_ERROR_DEVICE_LOST
[2019.05.23-03.43.25:734][105]LogWindows: Error:
[2019.05.23-03.43.25:734][105]LogWindows: Error:
[2019.05.23-03.43.25:734][105]LogWindows: Error: Unhandled Exception: 0x00008000
[2019.05.23-03.43.25:734][105]LogWindows: Error:
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff9200a9129 KERNELBASE.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1e33637 UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1e346b0 UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1c47cea UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1bcfe07 UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8bddfbc32 UE4Editor-VulkanRHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8bdd8a5ba UE4Editor-VulkanRHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8bdd81682 UE4Editor-VulkanRHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8bdd83507 UE4Editor-VulkanRHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8bdd96895 UE4Editor-VulkanRHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8bddf7c01 UE4Editor-VulkanRHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8d770b2e7 UE4Editor-SlateRHIRenderer.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8d770b5b7 UE4Editor-SlateRHIRenderer.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff90897e8e0 UE4Editor-RHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff908971519 UE4Editor-RHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff90897fe50 UE4Editor-RHI.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1a522d8 UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1a52563 UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff908e1c111 UE4Editor-RenderCore.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1e44b0f UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff8f1e40877 UE4Editor-Core.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff9215b7974 KERNEL32.DLL!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error: [Callstack] 0x00007ff9236ca271 ntdll.dll!UnknownFunction []
[2019.05.23-03.43.25:734][105]LogWindows: Error:
[2019.05.23-03.43.25:734][105]LogWindows: Error: Crash in runnable thread RHIThread
[2019.05.23-03.43.25:760][105]LogExit: Executing StaticShutdownAfterError

My config :
CPU : X5690 oc 5Ghz
RAM : 21 Go
GPU : GTX 1070 EVGA