static func uploadSingUpInfo(fullName:String,email:String,password:String)->String{
    rootRef = FIRDatabase.database().reference()
    var returnVlue="not valid"

    FIRAuth.auth()?.createUserWithEmail(email, password: password) { (user, error) in
        if (error != nil){
            returnVlue=(error?.userInfo["error_name"]) as! String
        }
        else{

            let newUser = [
                "username": fullName
            ]
            rootRef.childByAppendingPath("User")
                .childByAppendingPath((user?.uid)!).setValue(newUser)
            NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isLogin")
            NSUserDefaults.standardUserDefaults().setObject(email, forKey: "email")
            NSUserDefaults.standardUserDefaults().setObject(user?.uid, forKey: "user_ID")
            print(NSUserDefaults.standardUserDefaults().objectForKey("user_ID"))
            returnVlue="valid"

        }
    }

    return returnVlue

}