Braces are required around the expression when HTTP_REQUEST

We have BigIP LTM 10.2.4 HF3. We are trying to test having an iRule help with web site down/maintenance window messages. When attempting to create the iRule below I receive, 01070151:3: Rule [MaintenanceTest] error: line 1: [braces are required around the expression] [when HTTP_REQUEST { if { [active_members Test_Pool] < 1 } { HTTP::respond 200 content.......

 

I am pretty limited in my iRule and HTML skills but from what I have been able to find is that this may be due to v10 and iRule with double byte character. Or maybe I am going about this entirely the wrong way.

 

Any advice is greatly appreciated.

 

when HTTP_REQUEST { if { [active_members Test_Pool] < 1 } { HTTP::respond 200 content {

 

 

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