print error message about limitation

Author: wchen-r7

modules/exploits/windows/local/ntapphelpcachecontrol.rb

@@ -131,6 +131,13 @@ def check
   end
 
   def exploit
+    if session.platform !~ /^x86\//
+      print_error("Sorry, this module currently only allows x86/win32 sessions.")
+      print_error("You will have to get a x86/win32 session first, and then you can")
+      print_error("select a x64 payload as this exploit's payload.")
+      return
+    end
+
     print_status("Uploading the payload DLL")
     upload_payload