diff --git a/app/controllers/seminars_controller.rb b/app/controllers/seminars_controller.rb
index 9137d7a..0d8ae90 100644
--- a/app/controllers/seminars_controller.rb
+++ b/app/controllers/seminars_controller.rb
@@ -172,8 +172,10 @@ class SeminarsController < ApplicationController
       time_now = Time.now
       params = OrbitHelper.params
       seminar = SeminarMain.find_by(uid: params[:uid])
+      registration_url = prefix_url + @registration_postfix
+      submission_url = prefix_url + '/home/submission'
       if !seminar.registration_status.blank? && seminar.signup_start_date <= time_now && ( seminar.signup_end_date.nil? ||  seminar.signup_end_date+1 >= time_now )
-        sign_up = ('<a href="'+ prefix_url + @registration_postfix + '" target="_blank">' + t('seminar.signup') + '</a>').html_safe
+        sign_up = ('<a href="'+ registration_url + '" target="_blank">' + t('seminar.signup') + '</a>').html_safe
       elsif seminar.registration_status.blank?
         sign_up = t('seminar.sign_up_not_open')
       elsif seminar.signup_start_date > time_now
@@ -184,12 +186,12 @@ class SeminarsController < ApplicationController
       if !seminar.registration_status.blank? && seminar.registration_status.include?('C') && seminar.contribute_start_date <= time_now && ( seminar.contribute_end_date.nil? || seminar.contribute_end_date+1 >= time_now )
         if !@@session[:seminar_signup_id].blank? 
           if @@session[:seminar_main_id] == seminar.id
-            contribute_action = ('<a href="'+ prefix_url + '?method=con_upload">' + t('seminar_signup.uploads') + '</a>').html_safe
+            contribute_action = ('<a href="'+ submission_url + '?method=con_upload">' + t('seminar_signup.uploads') + '</a>').html_safe
           else
-            contribute_action = ('<a href="'+ prefix_url + '?method=con_login">' + t('seminar_signup.con_login') + '</a>').html_safe
+            contribute_action = ('<a href="'+ submission_url + '?method=con_login">' + t('seminar_signup.con_login') + '</a>').html_safe
           end
         else
-          contribute_action = ('<a href="'+ prefix_url + '?method=con_login">' + t('seminar_signup.con_login') + '</a>').html_safe
+          contribute_action = ('<a href="'+ submission_url + '?method=con_login">' + t('seminar_signup.con_login') + '</a>').html_safe
         end
       end
       data = {
diff --git a/app/views/seminars/con_upload.html.erb b/app/views/seminars/con_upload.html.erb
index d184fb4..90ff858 100644
--- a/app/views/seminars/con_upload.html.erb
+++ b/app/views/seminars/con_upload.html.erb
@@ -70,12 +70,11 @@
 				<% end %>
 				<td>
 					<%= link_to t(:edit), prefix_url + '?method=edit_file&con_no=' + seminar_signup_contribute.id, :class => 'btn btn-primary' %> 
-					<%= form_with url: del_file_seminars_path, method: "post" do |f| %>
-					  <%= f.submit_tag t(:delete_), class: "btn btn-primary" %>
-					  <%= f.hidden_field_tag "referer_url", request.original_url.split(request.env["HTTP_HOST"]).last.split('?').first %>
-					  <%= f.hidden_field_tag "con_no", seminar_signup_contribute.id %>
+					<%= form_tag(del_file_seminars_path, {method: "post"}) do |f| %>
+					  <%= submit_tag t(:delete_), class: "btn btn-primary" %>
+					  <%= hidden_field_tag "referer_url", request.original_url.split(request.env["HTTP_HOST"]).last.split('?').first %>
+					  <%= hidden_field_tag "con_no", seminar_signup_contribute.id %>
 					<% end %>
-
 				</td>
 			</tr>
 			<% end %>