Page Error: undefined method `classForColumn' for nil:NilClass

RSP BACKTRACE

Handled by : Site Error Handler
NoMethodError: undefined method `classForColumn' for nil:NilClass
Stack:
  1. /var/data/www/sites/live.c21bowman.com/content/listings/residential.rsp:215:in `info'
  2. /usr/local/lib/ruby/2.4/rsp/controller.rb:105:in `handleRequest'
  3. /usr/local/lib/ruby/2.4/rsp/controller.rb:48:in `initialize'
  4. /usr/local/lib/ruby/2.4/rsp/rex/controller.rb:25:in `initialize'
  5. /var/data/www/sites/live.c21bowman.com/content/listings/residential.rsp:24:in `initialize'
  6. (eval):33:in `new'
  7. (eval):33:in `execController'
  8. /usr/local/lib/ruby/2.4/rsp/core.rb:429:in `runCode'
  9. /usr/local/lib/ruby/2.4/rsp/core.rb:396:in `run'
 10. /usr/local/lib/ruby/2.4/rsp/core.rb:258:in `handle'
 11. /usr/local/lib/ruby/2.4/rsp/core.rb:581:in `handle'
 12. /usr/local/lib/ruby/2.4/rsp/core.rb:887:in `handle'
 13. /usr/local/lib/ruby/2.4/rsp/platform/modruby.rb:20:in `handle'