Telligent ajax call

Hi,

I'm having some issues making an ajax post.

I receive an error 500 and I don't know how to tackle it.

I'm trying to send a user invitation makinh a call similar to the code below:

    jQuery.telligent.evolution.post({
       url: jQuery.telligent.evolution.site.getBaseUrl() + 'api.ashx/v2/users/invitations.json',
       data: { 
          'Email': email,
    	  'Message' :content
       },
       success: function(response) {
            $.telligent.evolution.notifications.show("The email has been sent", { type: 'success' });
        }

And I get an error stating  that I'm having validation errors..