SITL (Software In The Loop) can't be started

when I input the command below in Cygwin
cd ~/ardupilot/ArduCopter
make sitl -j2
there are some errors occur as below show
mk: No such file or directory
make: *** 没有规则可制作目标“/home/Administrator/ardupilot/modules/uavcan/libuavcan/”。 停止。

who can tell me why and how to solve this problem? Thanks very much.

Did you follow all the step explained in the wiki ?

try : -j2 --map --console

Yes,I follow all the step, and I check all the step several,times. It looks like lost some files lead to errors. But I am not sure which file it lost