Rails Validation Acceptance of Results in Format Error - ruby-on-rails-4

Question

In my Author model, I'm trying to validate if the Terms are accepted.
In schema, I have the field tos as a Boolean.
In the model, I have this for validation:
validates_acceptance_of :tos, :accept => true
In my form:
<%= content_for(:the_links) do %>
I agree to the <%= link_to "Terms of Service", tos_path,:remote => true %>
and <%=link_to "Privacy Policy", "#", :remote => true%>
<% end %>
<%= simple_form_for(#author) do |f| %>
<%= f.input :tos, :as => :boolean, label: false, boolean_style: :inline, :hint => content_for(:the_links)%>
<%= f.button :submit %>
<% end %>
The error I receive:
ActionController::UnknownFormat in AuthorsController#create
ActionController::UnknownFormat
The parameters look this this:
{"utf8"=>"✓",
"author"=>{
"tos"=>"0"},
"commit"=>"Create Author"}
My problem seems slightly different than this issue:
Validates acceptance always failing
but I have also tried:
deleting the attribute from the database
changing the validation to: validates :terms, :acceptance => {:accept => true}
Yet, I still get the format error.
Adding create action
def create
#author = Author.new(author_params)
#author.user_id = current_user.id
respond_to do |format|
if #author.save
merchant_account_params = {
:individual => {
:first_name => #author.first_name,
:last_name => #author.last_name,
:email => current_user.email,
:date_of_birth => #author.dob,
:ssn => #author.ssn,
:address => {
:street_address => #author.indiv_street,
:locality => #author.indiv_city,
:region => #author.indiv_state,
:postal_code => #author.indiv_postal_code
}
},
:business => {
:legal_name => #author.legal_name,
:dba_name => #author.dba,
:tax_id => #author.ein,
:address => {
:street_address => #author.bus_street,
:locality => #author.bus_city,
:region => #author.bus_state,
:postal_code => #author.bus_postal_code
}
},
:funding => {
:destination => "email",
:email => #author.venmo_email,
},
:tos_accepted => #author.tos,
:master_merchant_account_id => BT_SANDBOX_MASTER_MERCHANT,
:id => #author.id
}
result = Braintree::MerchantAccount.create(merchant_account_params)
if result.success?
#author.update(:status=>result.merchant_account.status)
format.html { redirect_to #author, notice: 'Author was successfully created.' }
format.json { render :show, status: :created, location: #author }
else
format.html { render :new }
format.json { render json: #author.errors, status: :unprocessable_entity }
end
end
end
end