Server ERROR

#(NoMethodError: undefined method `style' for nil:NilClass)
( ["/var/www/share/lib/iil/Task.rb:271:in `progressStyle'", "/var/www/share/lib/iil/Tasklist.rb:162:in `block in tableRow'", "/var/www/share/lib/iil/Tasklist.rb:161:in `each'", "/var/www/share/lib/iil/Tasklist.rb:161:in `tableRow'", "/var/www/share/lib/iil/Tasklist.rb:148:in `table'", "/var/www/Documents/progress.cgi:48:in `

'"] )