Why cannot open file : ml64.exe?

[tudou614]

1>------ Rebuild All started: Project: TiberianDawn, Configuration: Release x64 ------
2>------ Rebuild All started: Project: RedAlert, Configuration: Release x64 ------
2>Assembling LCWCOMP.ASM...
2>MASM : fatal error A1000: cannot open file : ml64.exe
2>I:\Program Files\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\BuildCustomizations\masm.targets(70,5): error MSB3721: The command "ml64.exe /c /nologo /Zi /Fo"x64\Release\LCWCOMP.obj" /W3 /errorReport:prompt ml64.exe /nologo /Zi /Fo /c "x64\Release\LCWCOMP.obj" /W3 /errorReport:prompt /Ta /TaLCWCOMP.ASM" exited with code 1.
2>Done building project "RedAlert.vcxproj" -- FAILED.
1>Assembling win32lib\TOBUFF.ASM...
1>MASM : fatal error A1000: cannot open file : ml64.exe
1>I:\Program Files\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\BuildCustomizations\masm.targets(70,5): error MSB3721: The command "ml64.exe /c /nologo /Zi /Fo"x64\Release\TOBUFF.obj" /W3 /errorReport:prompt ml64.exe /nologo /Zi /Fo /c "x64\Release\TOBUFF.obj" /W3 /errorReport:prompt /Ta /Tawin32lib\TOBUFF.ASM" exited with code 1.
1>Done building project "TiberianDawn.vcxproj" -- FAILED.
========== Rebuild All: 0 succeeded, 2 failed, 0 skipped ==========