How do you include between with other validation rules?

[lkomanetz]

I'm writing a simple form with the form builder. I have a text field that needs to be between 0 and 255. My validator looks like this

FormBuilderTextField(
    name: "recipeCode",
    validator: FormBuilderValidators.compose([
        FormBuilderValidators.required(),
        FormBuilderValidators.integer(),
        FormBuilderValidators.between(0, 255, errorText: "Must be between 0 and 255")
    ])
),

I get the following compiler error:

The element type 'FormFieldValidator' can't be assigned to the list type 'FormFieldValidator'.

I'm new to Dart and Flutter so I'm not really sure why I'm getting this error. I can use the min() and max() validations in its place for now but I'd rather use between.