[U-Boot] Error Code "rm cannot remove directory 'asm/arch' : Is a directory"

Hello All, I am trying to learn u-boot in xp. *http://d1.amobbs.com/bbs_upload782111/files_41/ourdev_649777NIY8KG.pdf http://d1.amobbs.com/bbs_upload782111/files_41/ourdev_649777NIY8KG.pdf*

When I am trying to build u-boot I got an error. When I call command "*make am3517_evm_config*" then *Error* is "rm cannot remove directory 'asm/arch' : Is a directory make : ***[am3517_evm_config] Error 1

This time I don't know what to do. anyone can help me out

Any Kind of suggestion would be appreciated.