ERR_UNRECOGNIZED_VERSION

Code: 3506 (3506)

As HRESULT:

S: 0 (Success)
C: 0 (Microsoft-defined)
N: 0 (Not an NTSTATUS value)
Facility: 0x000 (FACILITY_NULL: Default)
Code: 0x0db2 (3506)

As NTSTATUS:

Sev: 0 (STATUS_SEVERITY_SUCCESS)
C: 0 (Microsoft-defined)
Facility: 0x000 (Default)
Code: 0x0db2 (3506)

Documented in Win32

HLSL errors and warnings (comperrors.h): 3506

The compiler target isn't recognized.