/usr/local/tropo/tro/tro_kiji_categ.rb:344:in `kiji_categ_list2': undefined method `>' for nil:NilClass (NoMethodError)
from /usr/local/tropo/tro/tro_kiji_tag.rb:210:in `kiji_tag_conv'
from /usr/local/tropo/tro/tp_homepg.rb:74:in `homepg'
from /usr/local/tropo/tropo.rb:176:in `serve'
from /usr/local/tropo/tropo.rb:210:in `
'