I would first inspect the string and cables to make sure they appear to all be where they should be. Also make sure you are placing the rear of the rope in the right spot on the bow prior to cocking. Putting it in the wrong spot, would result in you possibly running out of leverage or rope while cocking. If you still can't get it cocked, I would recruit someone else to try to cock it to see if it indeed can make it through the entire cocking stroke. If it can be fully cocked, discharge it safely, then try shortening the rope a bit which increases your leverage. You might have to pull the string up with one hand to get it hooked onto the hooks of the cocker after shortening the rope.
I support all hunters, regardless of weapon or technique!