Error when invoking rosdep

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I am attempting to install the ZED ROS wrapper following the instructions here (https://github.com/stereolabs/zed-ros...) When executing rosdep install --from-paths src --ignore-src -r -y I recieve the following:

ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: zed_examples:
Cannot locate rosdep definition for [zed_display_rviz] zed_obj_det_sub_tutorial:
Cannot locate rosdep definition for [zed_wrapper] zed_video_sub_tutorial:
Cannot locate rosdep definition for [zed_wrapper] zed_tracking_sub_tutorial:
Cannot locate rosdep definition for [zed_wrapper] zed_depth_sub_tutorial:
Cannot locate rosdep definition for [zed_wrapper] zed_sensors_sub_tutorial:
Cannot locate rosdep definition for [zed_wrapper] zed_nodelet_example:
Cannot locate rosdep definition for [zed_wrapper] zed_wrapper:
Cannot locate rosdep definition for [zed_interfaces] zed_multicamera_example:
Cannot locate rosdep definition for [zed_wrapper] zed_ar_track_alvar_example:
Cannot locate rosdep definition for [zed_wrapper] zed_display_rviz:
Cannot locate rosdep definition for [zed_wrapper] zed_ros:
Cannot locate rosdep definition for [zed_wrapper] zed_rtabmap_example:
Cannot locate rosdep definition for [zed_wrapper] Continuing to install resolvable dependencies...
#All required rosdeps installed successfully