gistfile1.txt

```
~/Documents/catkin_ws$ rosrun image_view image_view image:=camera/image_raw

(process:13010): GLib-GObject-WARNING **: invalid uninstantiatable type '(null)' in cast to 'GtkWidget'

(process:13010): GLib-GObject-WARNING **: instance of invalid non-instantiatable type '(null)'

(process:13010): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
```

and in another terminal

```
~/Documents/catkin_ws$ rostopic list
/camera/image_raw
/rosout
/rosout_agg
```