Type 'Post' does not conform to protocol 'Decodable' and Encodable

I wrote up a model for posts on a side project and I keep getting errors: "Type 'Post' does not conform to protocol 'Decodable'" "Type 'Post' does not conform to protocol 'Encodable'"

Please help

struct Post: Identifiable,Codable{
  @DocumentID var id: String?
  var text: String
  var imageURL: URL?
  var imageRefID: String = ""
  var createdAt: Date = Date()
  var likedIDs: [String] = []
  var dislikedIDs: [String] = []
  //Info about author of post
  var username: String
  var userUID: String
  var userProfileURL: URL
   
  enum CodingKeys: String, CodingKey {
    case id
    case text
    case imageURL
    case imageRefID
    case createdAt
    case likedIDs
    case dislikedIDs
    case usernanme
    case userUID
    case userProfileURL
  }
}