undefined method `call' for nil:NilClass

I think only two lines could cause this

@echantillon\.set\_eros\_values
  if @echantillon\.save

Which line does it say the error comes from in your output?

You could write some

Rails.logger.debug "Hi, this is the current status:
#{@echantillon.inspect}"

between every line and then watch your logs/development.log to see
where exactly it breaks.

I would guess on set_eros_values (whatever that function is supposed
to do :slight_smile: