Unable to call mount, I'm stuck at the bottom of a slope. Please help.

Sleight spoilers.....


I just got the mount, halfway up the slope I saw a possible place to explore to the left of the log.
I jumped off the mount onto the log and went to make the jump but missed, and fell to the bottom.

I'm near the save point, the button to call the mount is not working. I'm unable to climb the slope, and fast travel isn't working.

Does anyone know how I can fix this?