ActionController throws UnknownFormat while uploading a picture - ruby-on-rails

Question

Im trying to upload a photo through my Rails app and everything is fine until I click on "update...". Then it throws me an "ActionController::UnknownFormat" error and fails. Here you can find the form I'm using, the update controller and the model I'm referring to.
Form:
<%= form_with(model: current_user, local: true, html: {multipart: true}) do |form| %>
<div class="field">
<%= form.label :profile_pic %>
<%= form.file_field :profile_pic, id: :profile_pic %>
</div>
<div class="actions">
<%= form.submit %>
</div>
<% end %>
Update method:
def update
#user = current_user
respond_to do |format|
if #user.update(user_params)
format.html { redirect_to #user, notice: 'User was successfully updated.' }
format.json { render :show, status: :ok, location: #user }
else
render action: :edit
end
end
end
Error seems to be here:
respond_to do |format|
model:
require 'digest'
class User < ApplicationRecord
mount_uploader :profile_pic, ProfilePicUploader
attr_accessor :password
before_save :encrypt_new_password
after_create :build_profile
has_one :profile
has_many :trips
has_many :comments, through: :trips, source: :comments
has_many :posts, through: :trips, source: :posts
scope :recent_comments, ->{where("comments.created_at > ? AND user_id = ?", [6.months.ago, self.id]).limit(3)}
#friends
has_many :users
validates :email, uniqueness: {case_sensitive: false, message: 'El correo debe ser único'}, length: {in: 6..50, too_short: "debe tener al menos %{count} caracteres"}, format: {multiline: true,with: /^.+#.+$/, message: "formato de correo no valido"}
validates :password, confirmation: true, length: {within: 4..20}, presence: {if: :password_required?}
validates :password_confirmation, presence: true
def self.authenticate(email,password)
user = find_by_email(email)
return user if user && user.authenticated?(password)
end
def authenticated?(password)
self.hashed_password == encrypt(password)
end
protected
def encrypt_new_password
return if password.blank?
self.hashed_password = encrypt(password)
end
def password_required?
hashed_password.blank? || password.present?
end
def encrypt(string)
Digest::SHA1.hexdigest(string)
end
def build_profile
Profile.create(user: self, name: self.name, bio:"Im using Tripper!")
end
end
If anyone could tell me please what did I do wrong...

Answer 1

You have used the respond_to block, but you didn't specify the format in which edit action should be rendered.
Try updating the update action as below:
def update
#user = current_user
respond_to do |format|
if #user.update(user_params)
format.html { redirect_to #user, notice: 'User was successfully updated.' }
format.json { render :show, status: :ok, location: #user }
else
format.html { render 'edit'} # Specify the format in which you are rendering the 'edit' page
format.json { render json: #user.errors } # If required, specify a json format as well
end
end
end

Answer 2

Try to the following by updating the update action
def update
#user = current_user
respond_to do |format|
if #user.update(user_params)
flash[:notice] = 'User was successfully updated.'
format.html {redirect_to user_path(#user) }
format.json { render :show, status: :ok, location: #user }
else
render action: :edit
end
end
end
Hope to help