This is very likely a problem with the safety sensors on your opener. If you hold the button down on the inside wall control, does the door then close? If so, then I would say that we're almost certainly going to be looking at the safety sensors.
Check the sensors to see if they're both lit up. If they are, when you try to close the door check to see if they blink any or flicker. If they do, they are not aligned correctly and may need to be tweaked just a little bit.
Let me know what you find out.
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