I want to save an object, but i am get errors:

this is my firebase-document:


this is my method:

saveContact: function() {
   this.$.ref.save(this.$.ref.path, this.contato);

I am get this error: 

firebase.js:318 Uncaught (in promise) Error: Firebase.child failed: First 
argument was an invalid path: 
"XXXXX/user/5iTMV0vyigOIvHpG00puivCdsfA3/[object Object]". Paths must be 
non-empty strings and can't contain ".", "#", "$", "[", or "]"(…)

I need help, thanks.

Rodolfo Azevedo

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