tcl script error

Line 23 has a '.' in front of the

status.availability-state

Or copy from here:

modify script virtual_stat.tcl {

proc script::init { } {
}

proc getPartition { partition } {
        puts $partition
        flush stdout
        return [gets stdin]
Choose the partition you want to be tested
}
proc script::run { } {

   set up ""
   set down ""
   set total 0
   set out 0
   set part [getPartition "Enter the partition you want to be tested"]
   tmsh::cd \/$part
   foreach { virtual } [tmsh::get_status /ltm virtual] {
       set total [expr { $total + 1 }]
       if { "available" ne [tmsh::get_field_value \
                   $virtual "status.availability-state"] } {
           set out [expr { $out + 1 }]
           append down "    " [tmsh::get_name $virtual] "\n"
       }
   }

   set result "\n\n"
   append result $out " pools are down among " $total "\n Inactive Virtuals:\n\n"
   if { [string length $down] == 0 } {
       append result "    none\n"
   } else {
       append result $down
   }
   tmsh::display $result
}

proc script::help { } {
   tmsh::add_help "display the list of virtual servers that are down"
}

proc script::tabc { } {
    if this function does nothing then tmsh will (visual) beep
}

}