Problems in rails with non-existent validations

Well the problem that I present is that when adding the gem carrierwave-google-storage I am presenting problems throughout the app executing validations (which do not exist) throughout the application and are incongruent

Example:

{
  "user": {
   "first_name": "nombre",
   "user_address_attributes":[
    {"name": "calle falsa123"}
   ]
 }
}

Answer:

"errors": {
 "user_address_attributes.user":[
  {
    "error": "blank"
  }
 ]
}

and so for all the fields that I have.

PS: "these fields are optional and do not have validations"