Flash Failed VS CODE KEIL STUDIO

Hello,

I'm testing Visual Studio Code Keil Studio Pack. I imported solution from Keil into VS Code and build it successfully. Problem comes while trying to Run target. I get this error:

Stopping running target Cortex-M4 on connection
Connected to running target Cortex-M4

Execution stopped in Privileged Thread mode at 0x0800092E

0x0800092E   LDR      r0,[sp,#0x5c]

Disconnected from stopped target Cortex-M4

ERROR(TAD289-FLP24-FLP6-FLP4): 
! Failed to open flash programmer
! Failed to load flash device configuration from com.arm.debug.flashprogrammer.adapter.FlashConfigAdapter$CmsisFlashConfig@638aaf2
! Cannot create PyString with non-byte value: 'SE\u010c'
! Exception IllegalArgumentException thrown in Python script C:\Users\xxxxxx\.vcpkg\artifacts\2139c4c6\debuggers.arm.armdbg\6.2.1\sw\debugger\configdb\Flash\flashprogrammer\execution.py at line 14



Flash failed

I use ST-LINK with newest fw. task.json was set up for SWD, connect under reset and otherwise auto option. 

Am I missing something? Is there solution or bug issue?