Why the class can't be recognized when i try to add a picker cell with two component?

[RainbowMango]

I add a new swift file like 'FormPickerCell' named 'FormTwoComponentPickerCell'. I want to use picker with two components.
I extend FormRowType also as follows
enum FormRowType {
...
case Picker
case TwoComponentPicker
...
}

When i add this new class to FormViewController in function defaultCellClassForRowType like
Static.defaultCellClasses[FormRowType.TwoComponentPicker] = FormTwoComponentPickerCell.self

Xcode says 'Use of unresolved identifier 'FormTwoComponentPickerCell''.
By the way, the new class added just the same as FormPickerCell except class name.

Could any one give me a hit? thanks.

[RainbowMango]

I found the root cause. When add new file to project, target member ship should select both 'SwiftForms' and 'SwiftFormsTests'