2016-05-27 13:10:57, Info CBS Calling client to resolve source, cannot find file 'api-ms-win-core-util-l1-1-0.dll' at path: \\?\C:\Windows\SoftwareDistribution\Download\5b94cfccf8026155b37fdc15c738f964\amd64_microsoft-windows-minkernelapinamespace_31bf3856ad364e35_6.1.7601.23072_none_691e7920abbfd697\api-ms-win-core-util-l1-1-0.dll
2016-05-27 13:10:57, Error CBS Exec: Failed to pre-stage package: Package_250_for_KB3068708~31bf3856ad364e35~amd64~~6.1.1.0, file: api-ms-win-core-util-l1-1-0.dll, source: \\?\C:\Windows\SoftwareDistribution\Download\5b94cfccf8026155b37fdc15c738f964\amd64_microsoft-windows-minkernelapinamespace_31bf3856ad364e35_6.1.7601.23072_none_691e7920abbfd697\api-ms-win-core-util-l1-1-0.dll, sandbox: (null) [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
2016-05-27 13:10:57, Info CBS Failed to gather all required files. [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
2016-05-27 13:10:57, Info CBS Failed to gather all missing files for package: Package_for_KB3068708~31bf3856ad364e35~amd64~~6.1.1.0 [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
2016-05-27 13:10:57, Info CSI 00000200@2016/5/27:20:10:57.368 CSI Transaction @0xc9427a0 destroyed
2016-05-27 13:10:57, Error CBS Failed to pre- stage package: Package_for_KB3068708~31bf3856ad364e35~amd64~~6.1.1.0 [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
2016-05-27 13:10:57, Info CBS Perf: Stage chain complete.
2016-05-27 13:10:57, Info CBS Failed to stage execution chain. [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
2016-05-27 13:10:57, Error CBS Failed to process single phase execution. [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]