Strange path to cpp

Unreal Engine 4 was installed on disk C. My Project is on disk C.
Disk D use only for “D:\Unreal Engine 4\Cache\VaultCache”.
But sometime I got error:

LogOutputDevice: Error: === Handled ensure: ===
LogOutputDevice: Error: Ensure condition failed: false [File:D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\KismetDebugUtilities.cpp] [Line: 1154]
LogOutputDevice: Error: Error: Invalid (but non-null) property associated with pin; cannot get variable value

Why is this path “D:\Build”?

That’s the path on the machine that was used to build the launcher version, somewhere in Epic’s offices.