GarageBand not opening on MacBook Pro When I try to open GarageBand it comes up with the error message 'GarageBand quit unexpectedly' as pictured. 

When I try to reopen it it bounces around for a bit and then comes up with this message again. 
I have tried re-installing and deleting preferences, neither of which worked. I am using a MacBook Pro, 10.10.5
Can anyone help me?
This may seem obvious and standard computer practice, but restarting my computer worked - the most simple and easy solution that the Internet never recommends or even mentions.