fixed various error messages

app/views/candidate/welcome.html.erb

@@ -38,6 +38,10 @@
       <div class="form-group">
         <label for="userid">What's your User ID?</label>
         <input type="text" id="test_id" name="test_id" required/>
+
+        <% if flash[:error].present? %>
+            <div class="error"><%= flash[:error] %></div>
+        <% end %>
       </div>
       <button type="submit">Begin</button>
     <% end %>