My amana bottom freezer not freezing

My Amana bottom freezer is not freezing please help?

I noticed in the am there was frost on a package but didnt think anything about it. When i got home from work it was still cold but everything as defrosting and the ice was melting. I transferred to my outside freezer so nothing went bad. Thank Goodness

The upper fridge works fine and i cleaned the dust from the coils on the bottom, it was not to bad.

Model # ABL2522FESS