matlab 2021a on windows10 rosgenmsg can't find all.cmake?

CMake Error at CMakeLists.txt:27 (include):

include could not find load file:

C:/custom/src/matlab_msg_gen_ros1/win64/src//cmake/all.cmake

CMake Error at CMakeLists.txt:28 (add_subdirectory):

add_subdirectory not given a binary directory but the given source

directory "C:/custom/src/matlab_msg_gen_ros1/win64/src" is not a

subdirectory of "C:/custom/src/matlab_msg_gen_ros1/win64/src". When

specifying an out-of-tree source a binary directory must be explicitly

specified.