Problem with the helpers

Hi everyone, sorry but I’m not very knowledgeable about HA …
I must have done something, but I don’t know what, now if I try to create a counter helper, I can’t do it anymore!
I state that in the configuration.yaml there is both default_config: utility_meter: counter:

To be able to add Helpers via the user interface you should have default_config: in your configuration.yaml, it should already be there by default unless you removed it. If you removed default_config: from your configuration, you must add counter: to your configuration.yaml first, then you can use the UI.

Sorry but I don’t get it right, do I need to add this thing in the configuration.yalm? Because, before I could use it from the user interface, now not anymore!