error of makefile

[yxliu0903]

when running ./build_and_install_kernel.sh , it show that:
make distclean
make[1]:***Documentation/Kbuild: Is a directory. Stop.
make: ***[Makefile: 1858: _clean_Documentation] Error 2

[yuhong-zhong]

The problem seems similar to the one discussed here

Could you please check if you are using a case-insensitive file system?