Dagana config file error

[AlessioLovato]

By default the dagana is included in the src/modular/config_file.yaml and during startup if the package iit-dagana-ros-pkg has not been built, an error is thrown and the URDF of the robot is not shown.

ERROR LOG:

[ERROR] [launch]: Caught exception in launch (see debug for traceback): executed command failed. Command: python3 /home/user/xbot2_ws/install/share/concert_examples/concert_example.py -o urdf -a gazebo_urdf:=false floating_base:=true realsense:=false velodyne:=false ultrasound:=false imu:=false use_gpu_ray:=false -r modularbot
Captured stderr output: Traceback (most recent call last):
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 55, in get_expanded_path
    expanded_path = re.sub(r"\$\(([^\)]+)\)", path_substitution, expanded_path)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/re/__init__.py", line 186, in sub
    return _compile(pattern, flags).sub(repl, string, count)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 51, in path_substitution
    cmd_output = subprocess.check_output(cmd.split(), stderr=subprocess.DEVNULL).decode('utf-8').rstrip()
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/subprocess.py", line 466, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['ros2', 'pkg', 'prefix', '--share', 'dagana_urdf']' returned non-zero exit status 1.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/xbot2_ws/install/share/concert_examples/concert_example.py", line 6, in <module>
    urdf_writer = UrdfWriter(speedup=True, floating_base=True)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/URDF_writer.py", line 1059, in __init__
    self.modular_resources_manager = ModularResourcesManager(self.resource_finder)
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 199, in __init__
    self.init_available_modules()
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 291, in init_available_modules
    resource_names_list = ['yaml/' + el for el in self.expand_listdir('yaml', res_path)]
                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 210, in expand_listdir
    listdir = self.resource_finder.get_listdir(starting_path, res_path)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 135, in get_listdir
    resource_path = self.find_resource_path(resource_name, relative_path)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 68, in find_resource_path
    resource_path = self.find_external_resource_path(resource_name, relative_path)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 77, in find_external_resource_path
    resource_path = '/'.join((self.get_expanded_path(relative_path), resource_name))
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/xbot2_ws/src/modular/src/modular/utils.py", line 58, in get_expanded_path
    raise RuntimeError(msg)
RuntimeError: Executing $(ros2 pkg prefix --share dagana_urdf) resulted in an error. Path substitution cannot be completed. Are the required environment variables set?