.. _matlab_connector_error:

Matlab Connector Error
======================

If you get an error such as the following when starting your model:

.. code-block:: text

    Error using connector.ensureServiceOn
    Error starting MATLAB Connector. Please check that port 31515 is available.

    Error in slmsgviewer

    Error in oe_clear_build_list (line 31)
      disp('Clearing previously loaded build list.');

    Error in oe_read_build_list (line 77)
    oe_clear_build_list;

    Error in oe_make_rtw_hook (line 152)
        oe_read_build_list(modelName);

    Error in openecu_make_rtw_hook (line 6)
        [restored, hModel] = oe_make_rtw_hook(makeRTWHookMethod, ...

    Error in openmdl (line 12)
        evalin('base', ['open_system(''' strrep(filename, '''','''''') ''');'] );

    Error in open (line 158)
                feval(openAction,fullpath);

    Error in uiopen (line 167)
                open(fn);
    ...

This is an issue with the MATLAB configuration. It can be fixed with the following:

1. Set the `Environment Variables <Enviornment Variable>`_ to ``-Djava.net.preferIPv4Stack=true``.
2. Reset the computer to enable the change.

More details can be found at the `Mathworks help forums <https://www.mathworks.com/matlabcentral/answers/247798-connector-error-matlab-2015b>`_.