Building of AirSim on win10 failed with this error why please?

[Jack2563]

"C:\Windows\System32\AirSim\AirSim.sln" (default target) (1) ->
"C:\Windows\System32\AirSim\AirLib\AirLib.vcxproj" (default target) (8) ->
(ClCompile target) ->
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\BooleanRedux.h(111,6): error C2220: the following warning is treated as an error [C:\Wi
ndows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]
C:\Windows\System32\AirSim\AirLib\include\Eigen\src\Core\CoreEvaluators.h(219,9): error C2220: the following warning is treated as an error [C:
Windows\System32\AirSim\AirLib\AirLib.vcxproj]

104 Warning(s)
8 Error(s)