Mission Control stopped working then Dock won't restart

by affa   Last Updated October 09, 2019 22:12 PM - source

i am using a macbook air and with yosmite os

At first I could still switch between desktops, just that i could not swipe up/down to access mission control and app exposé. I tried typing in killall Dock into terminal to restart dock, but now i cant switch desktops either and the background is completely black. killall dock just tells me it can't find the process for this user. when i typed in killall -s dock it showed only one process.

is there a way to force dock to start and fix mission control?

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