Hi everyone I'm new here and have a problem I hope someone can help me with. I purchased a new Chamberlain belt drive opener and installed it myself but when I tested it for the first time it started out ok but then started to make a binding noise and stopped half way and the unit started clicking for about five seconds. At first I thought there was something stopping the trolly but I didn't see anything that was abstructing it. Did skip a step or did I get a manual that was missing a page?

Please help!!!

Thanks in advance