[Discuss-gnuradio] Grey Connection problem

[waqasme]

Hello everyone,
I am trying to implement DQPSK implementation in GRC and trying to transfer
image  but i am getting this error message . Also some of my connection are
grey. Can anyone please tell me what does grey connection means? and how to
fix that?
i tried to remove the connection and also put new connection still some are
the connections shows grey color insetad of black. here is the error message
i am getting 

Form: <class 'gnuradio.wxgui.forms.forms.log_slider'> -> gain_mu Error
translating value: "0.0"
        math domain error
        Value should be within slider range
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/forms/forms.py",
line 100, in <lambda>
    widget.Bind(EVT_DATA, lambda x: self._update(x.data))
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/forms/forms.py",
line 179, in _update
File "/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_controls.py",
line 2672, in SetValue
    return _controls_.Slider_SetValue(*args, **kwargs)
TypeError: in method 'Slider_SetValue', expected argument 2 of type 'int'
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/forms/forms.py",
line 100, in <lambda>
    widget.Bind(EVT_DATA, lambda x: self._update(x.data))
  File "/usr/lib/python2.6/dist-packages/gnuradio/wxgui/forms/forms.py",
line 179, in _update
    def _update(self, value): self._slider.SetValue(value)
File "/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_controls.py",
line 2672, in SetValue
    return _controls_.Slider_SetValue(*args, **kwargs)
TypeError: in method 'Slider_SetValue', expected argument 2 of type 'int'

I will be very grateful if anyone help me out regarding this error message.
Thanks and Regards,
Waq.
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