Why am I getting nil errors in "create_time_zone_conversion_attribute?"

Where do I start in trying to determine how to diagnose and debug this 
issue?  I have been looking at it for a couple of days now and I am pretty 
stuck.  What should one be looking for in order to track this down?


/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_methods/time_zone_conversion.rb:56:in
 
`create_time_zone_conversion_attribute?'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_methods/time_zone_conversion.rb:35:in
 
`define_method_attribute='
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activemodel-4.0.0/lib/active_model/attribute_methods.rb:287:in
 
`block in define_attribute_method'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activemodel-4.0.0/lib/active_model/attribute_methods.rb:280:in
 
`each'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activemodel-4.0.0/lib/active_model/attribute_methods.rb:280:in
 
`define_attribute_method'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activemodel-4.0.0/lib/active_model/attribute_methods.rb:246:in
 
`block in define_attribute_methods'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activemodel-4.0.0/lib/active_model/attribute_methods.rb:246:in
 
`each'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activemodel-4.0.0/lib/active_model/attribute_methods.rb:246:in
 
`define_attribute_methods'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_methods.rb:29:in
 
`block in define_attribute_methods'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_methods.rb:26:in
 
`synchronize'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_methods.rb:26:in
 
`define_attribute_methods'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_methods.rb:167:in
 
`respond_to?'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_assignment.rb:44:in
 
`rescue in _assign_attribute'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_assignment.rb:42:in
 
`_assign_attribute'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_assignment.rb:29:in
 
`block in assign_attributes'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_assignment.rb:23:in
 
`each'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/attribute_assignment.rb:23:in
 
`assign_attributes'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/core.rb:192:in
 
`initialize'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/inheritance.rb:27:in
 
`new'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/inheritance.rb:27:in
 
`new'
/Users/myself/.rvm/gems/ruby-2.0.0-p247@rails4/gems/activerecord-4.0.0/lib/active_record/reflection.rb:189:in
 
`build_association'
....

Completed 500 Internal Server Error in 2939ms

NoMethodError (undefined method `save' for nil:NilClass):
  app/controllers/registrations_controller.rb:45:in `block (2 levels) in 
create'
  app/controllers/registrations_controller.rb:8:in `create'


Thanks!

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