root@hostname:~# php /var/www/racktables_beta/test.php 
/// BEGIN makeIPtree ///
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iptree_embed (192.168.0.0/20, 192.168.0.0/21): split left
iptree_embed (192.168.0.0/21, 192.168.0.0/21): 
iptree_embed (192.168.0.0/16, 192.168.8.0/21): PHP Fatal error:  Uncaught exception 'RackTablesError' with message 'cannot decide between left and right' in /var/www/RackTables-0.20.0/wwwroot/inc/functions.php:2339
Stack trace:
#0 /var/www/RackTables-0.20.0/wwwroot/inc/functions.php(1944): iptree_embed(Array, Array)
#1 /var/www/RackTables-0.20.0/wwwroot/inc/functions.php(2349): iptree_fill(Array)
#2 /var/www/RackTables-0.20.0/test.php(13): treeApplyFunc(Array, 'iptree_fill')
#3 {main}
  thrown in /var/www/RackTables-0.20.0/wwwroot/inc/functions.php on line 2339