I had the same problem, here is what we found. there is a plastic gear that opens and closes the awning, so as you can imagine the plastic has worn to the point it won't engage. Try putting pressure on the top of the awning while someone trys to open and close. If it is the plastic gear you will probably get it to engage. Now for the real problem, you cannot buy just the plastic gear, you have to buy the whole assembly from A&E. You might try some other sources if that is the problem, maybe a good hobby supply shop or find a machine shop and have a metal one made.
2005 Winnebago Vectra, 2013 Ford Edge AWD toad, Jim & Barb along with our two Westie co pilots Maggie and Buddy