custom cell error

[Raphael95]

when i custom the cell, i implement the class FormBaseCell and override the function configure() and update(), also a variable named myImage as type UIImageView was defined in it. However, it raises an error "this class is not key value coding-compliant for the key myImage." while setting the property 'myImage' in FormViewController class using 'row.configuration.cell.appearance = ["myImage.image": UIImage(named: "Photo") as AnyObject]'. What should i do ?