Invoking "make -j4 -4" in melodic failed

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Here is the error. Thanks for your help. I am running on Ubuntu 18.04

#### Running command: "make cmake_check_build_system" in "/tests/simulation_ws/build"
#### Running command: "make -j4 -l4" in "/tests/simulation_ws/build"
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_ControllerState
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_RC
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_HeightCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_Supply
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_PositionXYCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_ThrustCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_RuddersCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_RawRC
[  0%] Built target geometry_msgs_generate_messages_eus
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_MotorStatus
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_MotorCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_RawMagnetic
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_YawrateCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_AttitudeCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_Altitude
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_Altimeter
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_RawImu
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_Compass
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_VelocityXYCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_HeadingCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_MotorPWM
[  0%] Built target geometry_msgs_generate_messages_py
[  0%] Built target geometry_msgs_generate_messages_lisp
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_VelocityZCommand
[  0%] Built target _cvg_sim_msgs_generate_messages_check_deps_ServoCommand
[  0%] Built target geometry_msgs_generate_messages_nodejs
[  0%] Built target geometry_msgs_generate_messages_cpp
[  0%] Built target std_msgs_generate_messages_lisp
[  0%] Built target _mav_msgs_generate_messages_check_deps_CommandTrajectory
[  0%] Built target _mav_msgs_generate_messages_check_deps_CommandRateThrust
[  0%] Built target _mav_msgs_generate_messages_check_deps_MotorSpeed
[  0%] Built target _mav_msgs_generate_messages_check_deps_CommandRollPitchYawrateThrust
[  0%] Built target _mav_msgs_generate_messages_check_deps_CommandMotorSpeed
[  0%] Built target std_msgs_generate_messages_py
[  0%] Built target _mav_msgs_generate_messages_check_deps_CommandVelocityTrajectory
[  0%] Built target _mav_msgs_generate_messages_check_deps_CommandAttitudeThrust
[  0%] Built target std_msgs_generate_messages_cpp
[  0%] Built target std_msgs_generate_messages_nodejs
[  0%] Built target std_msgs_generate_messages_eus
[  0%] Built target _planning_msgs_generate_messages_check_deps_WayPointArray
[  0%] Built target _planning_msgs_generate_messages_check_deps_PlannerService
[  0%] Built target _planning_msgs_generate_messages_check_deps_PlanningResponse
[  0%] Built target _planning_msgs_generate_messages_check_deps_Octomap
[  0%] Built target sensor_msgs_generate_messages_lisp
[  0%] Built target octomap_msgs_generate_messages_lisp
[  0%] Built target _planning_msgs_generate_messages_check_deps_WaypointType
[  0%] Built target _planning_msgs_generate_messages_check_deps_WayPoint
[  0%] Built target sensor_msgs_generate_messages_py
[  0%] Built target octomap_msgs_generate_messages_py
[  0%] Built target _planning_msgs_generate_messages_check_deps_OctomapScan
[  0%] Built target sensor_msgs_generate_messages_eus
[  0%] Built target octomap_msgs_generate_messages_eus
[  0%] Built target octomap_msgs_generate_messages_cpp
[  0%] Built target sensor_msgs_generate_messages_cpp
[  0%] Built target sensor_msgs_generate_messages_nodejs
[  0%] Built target octomap_msgs_generate_messages_nodejs
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_adc_data_frame
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_demo
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_vision_perf
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_vision_detect
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_RecordEnable
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_magneto
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_vector31
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_rc_references
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_euler_angles
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_wifi
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_pressure_raw
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_vision_of
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_gyros_offsets
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_LedAnim
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_vision
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_kalman_pressure
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_video_stream
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_phys_measures
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_matrix33
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_vector21
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_altitude
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_wind_speed
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_games
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_raw_measures
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_vision_raw
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_FlightAnim
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_time
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_zimmu_3000
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_pwm
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_Navdata
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_CamSelect
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_trims
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_hdvideo_stream
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_watchdog
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_trackers_send
[  0%] Built target _ardrone_autonomy_generate_messages_check_deps_navdata_references
[  0%] Performing update step for 'ardronelib'
[  1%] Building CXX object tum_ardrone_sim/tum-simulator-indigo/cvg_sim_gazebo_plugins/CMakeFiles/hector_gazebo_ros_gps.dir/src/gazebo_ros_gps.cpp.o
[  1%] Building CXX object tum_ardrone_sim/tum-simulator-indigo/cvg_sim_gazebo_plugins/CMakeFiles/hector_gazebo_ros_magnetic.dir/src/gazebo_ros_magnetic.cpp.o
[  1%] Performing configure step for 'ardronelib'
No configure
[  1%] Built target _cvg_sim_gazebo_plugins_generate_messages_check_deps_SetBias
[  2%] Performing build step for 'ardronelib'
make[3]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.
[  2%] Built target nav_msgs_generate_messages_cpp
Libs already extracted
Building target static
[  2%] Built target test_trajectory
Scanning dependencies of target diffdrive_plugin_6w
Architecture x86_64 is already built
Creating universal static lib file from architectures x86_64
Build done.
Building ARDroneTool ...