Howto:Understand console output

This document is intended to list common errors and how to get rid of them.

OpenAL error <AL_INVALID_VALVE>: bind source <alGenSources>
Failed to generate audio source.

This error is probably displayed because of some misdirected audio settings in the aircrafts setup. Check the -sound.xml file of the aircraft and see if all files refered to really exist. If not, try to contact the author of the plane, so he can fix the problem in the CVS version or solve the problem yourself and let someone commit the patch.

Found unexpected subsystem: system exiting. JSBSim failed to load aircraft and/or engine model

You are probably trying to run an aircraft on a out-of-date version of FlightGear. The planes on the official download page are intended to be used with the latest version of FlightGear. Usage on any older systems may nog work.

Unkown exeption to the main loop. Abording...
Possible cause: No such file or directory

Setting your BPP to a lower value might work.

OpenAL error (AL_INVALID_VALUE): constructor (alBufferData)
Fatal error: Failed to buffer data.

Disabling sound is a temporarily solution for this problem.

FGMultiplayMgr::MP_ProcessData: No such file or directory

This is telling you that there's someone online on the multiplayerserver, using a plane that you do not have installed on your own system. In order to remove the error (and see the other plane) you have to install the plane that pilot is using.