[Rails] undefined method `call' for nil:NilClass

why would I be getting this error after submitting my form?

NoMethodError in EchantillonsController#create
undefined method `call' for nil:NilClass

This is my create method in the controller:

def create

@echantillon = Echantillon.new(params[:echantillon])
@echantillon.set_eros_values

respond_to do |format|
if @echantillon.save
if params[:echantillon][:vignette].blank?
format.html { redirect_to(@echantillon) }
format.xml { render :xml => @echantillon, :status
=> :created, :location => @echantillon }
else
render :action => "location"
end
else
format.html { render :action => "new" }
format.xml { render :xml => @echantillon.errors, :status
=> :unprocessable_entity }
end
end
end

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