Error: Invalid configuration key
################################

``dds`` uses a very simple key-value-pair plaintext configuration file format.
Receiving this error indicates that one of the keys in a configuration file is
invalid.

..  .
  TODO: Create reference documentation for packages and libs, and include
  those links in the seealso below.

.. seealso::

    - For defining a toolchain file, see :doc:`/guide/toolchains` and
      :ref:`toolchains.opt-ref`
    - For package and library configuration, see the :doc:`/guide/packages`
      page.