catkin_make error "make -j8 -l8" failed

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Hi, i have an error when i catkin_make the catkin_ws. It started when i did rm -rf build, after that i do catkin_make and it shows invoking make -j8 -I8 failed.

-- Configuring done
-- Generating done
-- Build files have been written to: /home/billy/catkin_ws/src
####
#### Running command: "make -j8 -l8" in "/home/billy/catkin_ws/build"
#### make: *** No targets specified and no makefile found.  Stop. Invoking "make -j8 -l8" failed billy@hp:~/catkin_ws$