Problem with MapPageRoute..

Hi,
 
Why I am getting object reference not set to an instance of an object with the following MapPageRoute?
 
I guess it's because of {ADDRESS} at the beginning without a name like Page/{ADDRESS{ but how can I solve it. I already sent all the three lines at the end of the MapPageRoute but still having the same problem, keep in mind the problem occuers only in the PostComment.aspx
 

<pre lang="cs">routes.MapPageRoute(&quot;volow_member_channel_post&quot;, &quot;{ADDRESS}/{GUID}&quot;, &quot;~/Post.aspx&quot;);
routes.MapPageRoute(&quot;volow_channel_home&quot;, &quot;{ADDRESS}&quot;, &quot;~/ChannelHome.aspx&quot;);
routes.MapPageRoute(&quot;volow_member_post_comment&quot;, &quot;{ADDRESS}/Comment/{GUID}&quot;, &quot;~/PostComment.aspx&quot;);</pre>