Error: Packages with unknown build types exist Can not build workspace with packages of unknown build_type

[GoodandNo]

Does anyone know how to solve the problem?
when i use the command "catkin_make_isolated --pkg visp_hand2eye_calibration"
My system is ubuntu 18.04 and i have already installed ros-melodic v1.14.13

[xushenghuaaa]

who knows?
help

[fspindle]

You need to build ViSP and set VISP_DIR env var. To this end follow ViSP quick installation instructions.

Then source your bashrc and try a new catkin_make