Changed fail_with output.

modules/exploits/unix/webapp/wp_wpshop_ecommerce_file_upload.rb

@@ -65,7 +65,7 @@ class Metasploit3 < Msf::Exploit::Remote
         fail_with(Failure::UnexpectedReply, "#{peer} - Unable to deploy payload, server returned #{res.code}")
       end
     else
-      fail_with(Failure::Unknown, 'ERROR')
+      fail_with(Failure::Unknown, 'Server did not respond in an expected way')
     end
 
     print_status("#{peer} - Calling payload...")