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Ruby

So I've been having a lot of trouble with ruby giving me 'not null' errors

I am following along this video and when i go to db: migrate I get a 'not null' error. Which is odd because he creates the file then instantly migrates it and it does not give him the same error.

https://gyazo.com/001f5cd571195dd3d8b4e31d8d0c1b55 here is a picture of the error.