JSBSim failed to open the configuration file

[Gor-Ren]

Hello and thanks for the great project. Unfortunately I am falling at the first hurdle: I cannot run any simulations.

$ JSBSim --aircraft=ball --initfile==reset00

JSBSim Flight Dynamics Model v1.0 May 30 2018 09:53:30
            [JSBSim-ML v2.0]

JSBSim startup beginning ...

Could not open file: Path "aircraft/ball/ball.xml"
  JSBSim failed to open the configuration file: Path "aircraft/ball/ball.xml"
  JSBSim could not be started

I have tried sudo privileges and specifying the root dir:

$ JSBSim --aircraft=ball --initfile==reset00 --root=~/Apps/jsbsim-code/
...
JSBSim failed to open the configuration file: Path "~/Apps/jsbsim-code/aircraft/ball/ball.xml"
...

Despite the fact that the files are clearly there in the specified root:

$ ls ~/Apps/jsbsim-code/aircraft/ball/
ball.xml  INSTALL  reset00_v2.xml  reset00.xml  reset01_v2.xml  reset01.xml

Same story for other aircraft (X15, 737). I am running a fresh install of Ubuntu 18.04. JSBSim was built and installed as per the repo instructions from latest commit b4dd258, with the DINSTALL_PYTHON_MODULE=ON flag. All tests run successfully (which means the simulations run perfectly happy from Python, so I am at a bit of a loss). Many thanks in advance for any help!

[bcoconni]

@Gor-Ren JSBSim does not expand ~ in paths (although shells usually replace ~ by the content of the environment variable $HOME). So you have to specify the root dir either by a relative path

$ JSBSim --root=../../relative/path/to/JSBSim/root/ --initfile=reset00 --aircraft=ball

or by an absolute path

$ JSBSim --root=/home/username/Apps/jsbsim-code --initfile=reset00 --aircraft=ball

[Gor-Ren]

@bcoconni aha, thank you! It is now working with the absolute path.