Ocaml compile on eclipse using Makefile occurs no file error even if there is

Question

When I try to compile my project with Makefile, it keeps show error that there is no file lang.ml even if there is in same path. It seems that make.exe can't totally recognize the file contents in projects. Maybe there is problem with entering directory /home/mario/eclipse/assignment/miniML_skel folder, but I can't find the way how to check or manange the path where make.exe actually gone through. However, the absolute path of project is C:/OCaml64/home/mario/eclipse/assignment/miniML_skel and workspace is set as C:/OCaml64/home/mario/eclipse/assignment. I create this project as an Ocaml Empty Makefile Project and import contents file from some other folder.

Here is paths of preference and project.

Note that if I compile lang.ml separately and create lang.cmo file, then make process normally detect it and continue.