Multiple redirect/respond invocations not allowed

Hi - I keep getting the following error message on my iRule:

Sep 9 07:09:42 local/tmm err tmm[5253]: 01220001:3: TCL error: ir_final_maintpage - Operation not supported. Multiple redirect/respond invocations not allowed (line 12) invoked from within "HTTP::respond 503 content "Hanley Wood, LLC - Maintenance Page

I've been told to add the TCP::close option. I believe this may fix my issue with the iRule but here is my question (2 really):

1. If I add the TCP::close option, will it essentially terminate ALL iRule calls after it executes this? Meaning, does this TCP::close option only deal with this particular iRule? I have several virtual servers that have multiple iRules and I'm concerned that adding this TCP::close option will make all other iRules not work.

2. Where should I add TCP::close? At the very end?

Thanks so much in advance.

-Albert.