I can't access Mission Control at all.

Mission control isn't accessible to me. I've tried F3, swiping up with three fingers, and even resetting Mission Control using both the Terminal and Activity Monitor. Nothing seems to be working.

For context (if it qualifies as context at all), I got my Macbook Air last year and I was using it fine, Mission Control still working correctly. However after a few months of using it, Mission Control gave out on me and I would never be able to access it ever again.

Please help me out.