I am using Ubuntu 18.04 LTS and melodic I have entered the following commands in order:

$catkin build

but when I use the catkin build command I get a CMake error as below:

Errors     << grasp_the_dice:cmake /home/member/catkin_ws2/logs/grasp_the_dice/build.cmake.011.log
CMake Error at /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
Could not find a package configuration file provided by
"rsj_pointcloud_test" with any of the following names:

rsj_pointcloud_testConfig.cmake
rsj_pointcloud_test-config.cmake

Add the installation prefix of "rsj_pointcloud_test" to CMAKE_PREFIX_PATH
or set "rsj_pointcloud_test_DIR" to a directory containing one of the above
files.  If "rsj_pointcloud_test" provides a separate development package or
SDK, be sure it has been installed.
Call Stack (most recent call first):
CMakeLists.txt:10 (find_package)