uninitialized constant [Incident::Involf]
===

I have a rails app that is using Active Admin. Basic flow is that I have an Incident model has associations with other models. Connections other models seem fine but for one model (Involves) in particular I get the error uninitialized constant Incident::Involf when creating a new Incident.

Incident model looks like this

    class Incident < ActiveRecord::Base
     # Relationships
     belongs_to :admin_user
     has_many :images
     has_and_belongs_to_many :incident_types
     has_and_belongs_to_many :involves
     has_and_belongs_to_many :special_considerations
  
     belongs_to :county
     belongs_to :location

  
     # Nested Attributes
     accepts_nested_attributes_for :images
     accepts_nested_attributes_for :county
     accepts_nested_attributes_for :location
     accepts_nested_attributes_for :incident_types
     accepts_nested_attributes_for :involves
     accepts_nested_attributes_for :special_considerations   
    end

The Involve model looks like this

    class Involve < ActiveRecord::Base
  
      # Relationships
      has_and_belongs_to_many :incidents
   
      # Aliases
      alias_attribute :name, :involved
   
    end

The active admin model for nested Incidents look like this

    f.inputs "Vehicles Involved" do
        f.input :involves, :as => :check_boxes
     end
      
    f.inputs "Special Considerations" do
        f.input :special_considerations, :as => :check_boxes
    end

Where Special Considerations work if I have f.input :involves, :as => :check_boxes commented out, but I get this error if I don't have it commented out. 

Looked at the database and the associations and the code is very similar to others that I am not sure what the problem is. 