So I am trying to light my fireplace for the first time of this winter, but the pilot light won't stay on.

The gas valve is in the open position, I have turned the gas knob to pilot, and pressed it down I can hear the gas. I then click the red ignitor button, the pilot light does go on but when I turn the knob to on it goes out.

With the knob in the on position, I cannot hear any gas, even though the valve is on.

The model is DT-600CMN manufactured by Superior.

Any pointers will be appreciated.