irule maintanance page issue

Can anyone out there tell me what could be wrong with this code for an irule to reference HTML for a maintance splash page?

when HTTP_REQUEST { if { [active_members [LB::server pool]] == 0 } { 
 check if client access from internal subnet
if { [IP::addr [IP::client_addr]/8 equals 10.0.0.0] } {
    pool alternate_pool
} else {
    HTTP::respond 200 content {   Sorry Page   Sorry, The website is not available. Please try again later  }
}

}

I am losing my mind over trying to figure it out. it is giving me a missing bracket error and when I input it into notepad++ it isn't showing any error. here is the errors it is giving me

01070151:3: Rule [/Common/test_maintanance] error: /Common/test_maintanance:1: error: [parse error: missing close-brace][{ if { [active_members [LB::server pool]] == 0 } { check if client access from internal subnet if { [IP::addr [IP::client_addr]/8 equals 10.0.0.0] } { pool alternate_pool } else { HTTP::respond 200 content { Sorry Page Sorry, The website is not available. Please try again later } } }] /Common/test_maintanance:2: error: [command is not valid in the current scope][if { [active_members [LB::server pool]] == 0 } { check if client access from internal subnet if { [IP::addr [IP::client_addr]/8 equals 10.0.0.0] } { pool alternate_pool } else { HTTP::respond 200 content { Sorry Page Sorry, The website is not available. Please try again later } }