'./update_dependencies.sh' error

[LuWang]

When i was adding dependencies with ubuntu 18.04 and ros melodic, it has this error code :
' ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
fssim: Cannot locate rosdep definition for [fssim-xacro]
fssim_gazebo_plugins: Cannot locate rosdep definition for [fssim-pcl-ros]'
how can i solve it? Thank you.

[Alexander]

Had the same issue. Problem lies with in that this project is based on Ubuntu 16.04 and the Kinetic version of ROS.

A melodic-devel branch was created but not yet merged into the master.

Cheers