An invalid WritablePage option can result the same message as well.

Author: wchen-r7

modules/exploits/unix/webapp/moinmoin_twikidraw.rb

@@ -240,7 +240,7 @@ def exploit
 
 		# Check authentication
 		if not session
-			fail_with(Exploit::Failure::NoAccess, "Error getting a session ID, check credentials")
+			fail_with(Exploit::Failure::NoAccess, "Error getting a session ID, check credentials or WritablePage option")
 		end
 
 		# Check writable permissions