catkin_make error

[113niko]

catkin_make in ubuntu18.04 and ros melodic error information:
-- Could NOT find pcl_conversions (missing: pcl_conversions_DIR)
-- Could not find the required component 'pcl_conversions'. The following CMake error indicates that you either need to install the package with the same name or change your environment so that it can be found.
CMake Error at /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
Could not find a package configuration file provided by "pcl_conversions"
with any of the following names:

pcl_conversionsConfig.cmake
pcl_conversions-config.cmake

Add the installation prefix of "pcl_conversions" to CMAKE_PREFIX_PATH or
set "pcl_conversions_DIR" to a directory containing one of the above files.
If "pcl_conversions" provides a separate development package or SDK, be
sure it has been installed.
Call Stack (most recent call first):
FUEL/uav_simulator/map_generator/CMakeLists.txt:8 (find_package)

-- Configuring incomplete, errors occurred!
See also "/home/yy/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/yy/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:320: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed