I do not know how to solve this problem when I use catkin_make. How do I solve it?

edit

CMake Warning (dev) at /usr/share/cmake-3.10/Modules/FindBoost.cmake:911 (if): Policy CMP0054 is not set: Only interpret if() arguments as variables or keywords when unquoted. Run "cmake --help-policy CMP0054" for policy details. Use the cmake_policy command to set the policy and suppress this warning.

  Quoted variables like "chrono" will no longer be dereferenced when the
  policy is set to NEW.  Since the policy is not set the OLD behavior will be
  used.
Call Stack (most recent call first):
  /usr/share/cmake-3.10/Modules/FindBoost.cmake:1558 (_Boost_MISSING_DEPENDENCIES)
  /usr/share/OGRE/cmake/modules/FindOGRE.cmake:318 (find_package)
  /usr/lib/x86_64-linux-gnu/cmake/gazebo/gazebo-config.cmake:175 (find_package)
  course_packages/sim_cf/crazyflie_gazebo/CMakeLists.txt:29 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Looking for OGRE_Paging...
-- Found OGRE_Paging: optimized;/usr/lib/x86_64-linux-gnu/libOgrePaging.so;debug;/usr/lib/x86_64-linux-gnu/libOgrePaging.so
-- Looking for OGRE_Terrain...
-- Found OGRE_Terrain: optimized;/usr/lib/x86_64-linux-gnu/libOgreTerrain.so;debug;/usr/lib/x86_64-linux-gnu/libOgreTerrain.so
-- Looking for OGRE_Property...
-- Found OGRE_Property: optimized;/usr/lib/x86_64-linux-gnu/libOgreProperty.so;debug;/usr/lib/x86_64-linux-gnu/libOgreProperty.so
-- Looking for OGRE_RTShaderSystem...
-- Found OGRE_RTShaderSystem: optimized;/usr/lib/x86_64-linux-gnu/libOgreRTShaderSystem.so;debug;/usr/lib/x86_64-linux-gnu/libOgreRTShaderSystem.so
-- Looking for OGRE_Volume...
-- Found OGRE_Volume: optimized;/usr/lib/x86_64-linux-gnu/libOgreVolume.so;debug;/usr/lib/x86_64-linux-gnu/libOgreVolume.so
-- Looking for OGRE_Overlay...
-- Found OGRE_Overlay: optimized;/usr/lib/x86_64-linux-gnu/libOgreOverlay.so;debug;/usr/lib/x86_64-linux-gnu/libOgreOverlay.so
-- Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread;-lpthread (found suitable version "3.0.0", minimum required is "2.3.0") 
-- Checking for module 'uuid'
--   Found uuid, version 2.31.1
-- Checking for module 'tinyxml2'
--   Found tinyxml2, version 6.0.0
-- Looking for dlfcn.h - found
-- Looking for libdl - found
-- FreeImage.pc not found, we will search for FreeImage_INCLUDE_DIRS and FreeImage_LIBRARIES
-- Checking for module 'gts'
--   Found gts, version 0.7.6
-- Checking for module 'libswscale'
--   Found libswscale, version 4.8.100
-- Checking for module 'libavdevice >= 56.4.100'
--   Found libavdevice , version 57.10.100
-- Checking for module 'libavformat'
--   Found libavformat, version 57.83.100
-- Checking for module 'libavcodec'
--   Found libavcodec, version 57.107.100
-- Checking for module 'libavutil'
--   Found libavutil, version 55.78.100
-- Checking for module 'jsoncpp'
--   Found jsoncpp, version 1.7.4
-- Checking for module 'yaml-0.1'
--   Found yaml-0.1, version 0.1.7
-- Checking for module 'libzip'
--   Found libzip, version 1.1.2
-- Boost version: 1.65.1
-- Found the following Boost libraries:
--   system
--   thread
--   timer
--   chrono
--   date_time
--   atomic
Using ROS (catkin_make)
-- Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread;-lpthread;-lpthread (found version "3.0.0") 
Gazebo version: 9.11
-- Boost version: 1.65.1
-- Found the following Boost libraries:
--   system
--   thread
--   timer
--   chrono
--   date_time
--   atomic
-- Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy
-- crazyflie_gazebo: 8 messages, 11 services
CMake Error at course_packages/sim_cf/crazyflie_gazebo/CMakeLists.txt:476 (add_executable):
  add_executable cannot create target "crazyflie_add" because another target
  with the same name already exists.  The existing target is an executable
  created in source directory
  "/home/iskander/catkin_ws/src/course_packages/crazyflie_ros/crazyflie_driver".
  See documentation for policy CMP0002 for ...