Error launching DQN_stage3 and DQN_stage4

[qwedaq]

Hi I followed all the steps mentioned in the turtlebot3 manual and I get this error whenever I try to launch dqn_stage3 and dqn_stage4. I am noob at ro2, please help me fix this.

System details:
Ubuntu 18.04
ROS2 dashing

[linzhuobin-fighter]

hi, I met with this problem too.
after I :

export GAZEBO_PLUGIN_PATH=$HOME/turtlebot3_ws/src/turtlebot3/turtlebot3_simulations/turtlebot3_gazebo/models/turtlebot3_dqn_world/obstacle_plugin/build:$GAZEBO_PLUGIN_PATH

problem solved. It looks like the path to the gazebo plugin(libobstacle1.so and libobstacle2.so) is missing and gazebo can't load them which causes this problem.