Most likely a dirty photo Eye or defective one. First step is clean the photo eye with mild soapy water. If light goes off after a while you have solved the problem. If it does not go out, the next most probable issue is a defective photo eye that needs replacement. If you can work electrical things then the easy step is to remove eye and get a new one that looks just like yours. This means you have to remove old one and take to any hardware store and get one the same size as the one you have, reinstall and the problem should be fixed.
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