one end of awning won't rool up

#1
On our 29' Puma we have a Dometic Sunchaser (manual not electric) awning, when i went to roll it up everything worked fine until about the last foot. One end rolled up completely, the other end was still a foot from the wall of the trailer. The awning is approx. 20' long.
What is wrong & how can I fix this?
 
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