I am getting this error while running jmavsim

[2/641] Generating uORB topic headers
FAILED: cd /home/anish/Firmware/msg && /home/anish/anaconda3/bin/python tools/px_generate_uorb_topic_files.py --headers -f actuator_armed.msg actuator_controls.msg actuator_direct.msg actuator_outputs.msg adc_report.msg airspeed.msg battery_status.msg camera_capture.msg camera_trigger.msg collision_report.msg collision_constraints.msg commander_state.msg cpuload.msg debug_array.msg debug_key_value.msg debug_value.msg debug_vect.msg differential_pressure.msg distance_sensor.msg ekf2_innovations.msg ekf2_timestamps.msg ekf_gps_drift.msg ekf_gps_position.msg esc_report.msg esc_status.msg estimator_status.msg follow_target.msg geofence_result.msg gps_dump.msg gps_inject_data.msg home_position.msg input_rc.msg iridiumsbd_status.msg irlock_report.msg landing_gear.msg landing_target_innovations.msg landing_target_pose.msg led_control.msg log_message.msg manual_control_setpoint.msg mavlink_log.msg mission.msg mission_result.msg mount_orientation.msg multirotor_motor_limits.msg obstacle_distance.msg offboard_control_mode.msg optical_flow.msg orbit_status.msg parameter_update.msg ping.msg position_controller_landing_status.msg position_controller_status.msg position_setpoint.msg position_setpoint_triplet.msg power_button_state.msg power_monitor.msg pwm_input.msg qshell_req.msg qshell_retval.msg radio_status.msg rate_ctrl_status.msg rc_channels.msg rc_parameter_map.msg safety.msg satellite_info.msg sensor_accel.msg sensor_baro.msg sensor_bias.msg sensor_combined.msg sensor_correction.msg sensor_gyro.msg sensor_mag.msg sensor_preflight.msg sensor_selection.msg servorail_status.msg subsystem_info.msg system_power.msg task_stack_info.msg tecs_status.msg telemetry_status.msg test_motor.msg timesync_status.msg trajectory_waypoint.msg transponder_report.msg tune_control.msg uavcan_parameter_request.msg uavcan_parameter_value.msg ulog_stream.msg ulog_stream_ack.msg vehicle_air_data.msg vehicle_attitude.msg vehicle_attitude_setpoint.msg vehicle_command.msg vehicle_command_ack.msg vehicle_constraints.msg vehicle_control_mode.msg vehicle_global_position.msg vehicle_gps_position.msg vehicle_land_detected.msg vehicle_local_position.msg vehicle_local_position_setpoint.msg vehicle_magnetometer.msg vehicle_odometry.msg vehicle_rates_setpoint.msg vehicle_roi.msg vehicle_status.msg vehicle_status_flags.msg vehicle_trajectory_waypoint.msg vtol_vehicle_status.msg wind_estimate.msg -i /home/anish/Firmware/msg -o /home/anish/Firmware/build/px4_sitl_default/uORB/topics -e templates/uorb -t /home/anish/Firmware/build/px4_sitl_default/msg/tmp/headers -q
python import error: No module named ‘em’

Required python packages not installed.

On a Debian/Ubuntu system please run:

sudo apt-get install python-empy
sudo pip install catkin_pkg

On MacOS please run:
sudo pip install empy catkin_pkg

On Windows please run:
easy_install empy catkin_pkg

ninja: build stopped: subcommand failed.
Makefile:200: recipe for target ‘px4_sitl’ failed
make: *** [px4_sitl] Error 1

Could you solve the problem ?