File_column crop

I can’t for the life of me figure out how to get cropping working with
file_column

file_column :pic, :magick => {
:versions => {
:thumb => {:crop => “3:2”, :size => “120x120!”, :name =>
“thumb”},
:big =>{ :size => “400x300”, :name => “big”}
}
}

gives me:
invalid geometry string `’

any ideas?

tx

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