Client Select iRule Failing to Compile

Try this instead:

 when CLIENT_ACCEPTED {
 set pool test_pool
  if {[IP::addr [IP::client_addr] equals 10.10.2.20]}{
  if {[LB::status pool $pool member 198.168.192.168 443] eq "up"}{      
   pool $pool member 192.168.192.168 443
   } else { 
   pool $pool 
 }
}    
}