Troubleshooting

This chapter contains tips for troubleshooting common problems in building and running OceanWATERS.

Build Problems

ow_simulator/ow_ephemeris

If the build fails with an error like this:

CMake Error at ....ow/src/ow_simulator/ow_ephemeris/CMakeLists.txt:42 (message):
  ....ow/src/ow_simulator/ow_ephemeris/data/jup365.bsp

The problem is that the download of jup365.bsp (over 1GB) failed, timed out, or is corrupted. A workaround is to download this file manually:

https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/satellites/jup365.bsp

and place it in ow_simulator/ow_ephemeris/data. Then retry catkin build.

Runtime Problems

Endless "Exception sending a message" messages in terminal.

This tends to happen when running Gazebo while on a VPN. To prevent these messages, do the following:

export IGN_IP=127.0.0.1

For convenience you can add this to your shell init file, e.g. .profile or .bashrc.

LCP errors

These look like:

ODE Message 3: LCP internal error, s <= 0 (s=-0.0000e+00)

and generally indicate that a collision has occurred. They should stop occurring if and when the collision is resolved.