Invoking "make -j4 -l4" failed

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Hi. I am trying to install the ego-planner package. When I run catkin_make, I get an error. I am running ROS Melodic on Ubuntu 18.04. How do I fix this? This is the output I get (I have included all of the output, because I wasn't sure what was relevant. Please feel free to edit my question and remove unnecessary lines):

Base path: /home/kadhir/catkin_ws/src/ego-planner
Source space: /home/kadhir/catkin_ws/src/ego-planner/src
Build space: /home/kadhir/catkin_ws/src/ego-planner/build
Devel space: /home/kadhir/catkin_ws/src/ego-planner/devel
Install space: /home/kadhir/catkin_ws/src/ego-planner/install
####
#### Running command: "cmake /home/kadhir/catkin_ws/src/ego-planner/src -DCATKIN_DEVEL_PREFIX=/home/kadhir/catkin_ws/src/ego-planner/devel -DCMAKE_INSTALL_PREFIX=/home/kadhir/catkin_ws/src/ego-planner/install -G Unix Makefiles" in "/home/kadhir/catkin_ws/src/ego-planner/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/kadhir/catkin_ws/src/ego-planner/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/melodic
-- This workspace overlays: /opt/ros/melodic
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.17", minimum required is "2") 
-- Using PYTHON_EXECUTABLE: /usr/bin/python2
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/kadhir/catkin_ws/src/ego-planner/build/test_results
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
-- Found PythonInterp: /usr/bin/python2 (found version "2.7.17") 
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.7.28
-- BUILD_SHARED_LIBS is on
-- BUILD_SHARED_LIBS is on
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~  traversing 18 packages in topological order:
-- ~~  - quadrotor_msgs
-- ~~  - cmake_utils
-- ~~  - map_generator
-- ~~  - plan_env
-- ~~  - path_searching
-- ~~  - bspline_opt
-- ~~  - pose_utils
-- ~~  - multi_map_server
-- ~~  - odom_visualization
-- ~~  - local_sensing_node
-- ~~  - mockamap
-- ~~  - so3_control
-- ~~  - traj_utils
-- ~~  - ego_planner
-- ~~  - uav_utils
-- ~~  - so3_quadrotor_simulator
-- ~~  - rviz_plugins
-- ~~  - waypoint_generator
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'quadrotor_msgs'
-- ==> add_subdirectory(uav_simulator/Utils/quadrotor_msgs)
-- Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy
-- quadrotor_msgs: 13 messages, 0 services
-- +++ processing catkin package: 'cmake_utils'
-- ==> add_subdirectory(uav_simulator/Utils/cmake_utils)
-- +++ processing catkin package: 'map_generator'
-- ==> add_subdirectory(uav_simulator/map_generator)
-- Boost version: 1.65.1
-- Found the following Boost libraries:
--   system
--   filesystem
--   thread
--   date_time
--   iostreams
--   serialization
--   chrono
--   atomic
--   regex
-- Could NOT find ensenso (missing: ENSENSO_LIBRARY ENSENSO_INCLUDE_DIR) 
** WARNING ** io features related to ensenso will be disabled
-- Could NOT find DAVIDSDK (missing: DAVIDSDK_LIBRARY DAVIDSDK_INCLUDE_DIR) 
** WARNING ** io features related to davidSDK will be disabled
-- Could NOT find DSSDK (missing: _DSSDK_LIBRARIES) 
** WARNING ** io features related to dssdk will be disabled
** WARNING ** io features related to pcap will be disabled
** WARNING ** io features related to png will be disabled
-- The imported target "vtkRenderingPythonTkWidgets" references the file
   "/usr/lib/x86_64-linux-gnu/libvtkRenderingPythonTkWidgets.so"
but this file does not exist.  Possible reasons include:
* The file was deleted, renamed, or moved to another location.
* An install or uninstall procedure did not complete successfully.
* The installation package was faulty and contained
   "/usr/lib/cmake/vtk-6.3/VTKTargets.cmake"
but not all the files it references.

-- The imported target "vtk" references the file
   "/usr/bin/vtk"
but this file does not exist.  Possible reasons include:
* The file was deleted, renamed, or moved to another location.
* An install or uninstall procedure did not complete successfully.
* The installation package was faulty and ...