ERROR:cannot launch gazebo

[wwpsnm]

Ubuntu14.04,ROS Indigo,install gazebo7.4（sudo apt-get install gazebo7）.When I input ”roslaunch ardrone_vislab_gazebo ardrone_vislab.launch“，cannot launch gazebo，terminal as follows:

Can anyone help me?How do I set up the gazebo path?Thanks!

[plinioMoreno]

It looks like the gazebo-ros interface is expecting another gazebo version. You have to follow the instructions here to decide which version of gazebo you want to run with ROS. And this is not really an issue of the ardrone_gazebo repository