CMake Error at FileSetDirect.cmake:3 \(add_library\):
  Cannot find source file:

    FILE_SET

  Tried extensions .c .C .c\+\+ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm .h
  .hh .h\+\+ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90 .f95 .f03 .hip .ispc

  Hint: the FILE_SET keyword may only appear after a visibility specifier or
  another FILE_SET within the target_sources\(\) command.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)