Octave gnuplot

warning: ft_render: invalid bounding box, cannot render
warning: called from
    axes at line 53 column 10
    gca at line 58 column 9
    newplot at line 147 column 8
    plot at line 219 column 9
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render
warning: ft_render: invalid bounding box, cannot render