# ArgumentError (interning empty string)

**URL:** <https://www.ruby-forum.com/t/argumenterror-interning-empty-string/169256>\
**Category:** Rails\
**Created:** [June 1, 2009, 2:49pm UTC](https://www.ruby-forum.com/t/argumenterror-interning-empty-string/169256 "2009-06-01T14:49:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zufar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/5f8ce5/32.png) [@zufar](https://www.ruby-forum.com/u/zufar)\
**Post date:** [June 1, 2009, 2:49pm UTC](https://www.ruby-forum.com/t/argumenterror-interning-empty-string/169256/1 "2009-06-01T14:49:07Z")

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Hello,

I am trying to send an email out on registration for confirming and I  
am thrown this error. I am unable to understand as nothing is nil in  
the class which I am passing to the Mailer. Please do help me. The  
stack trace follows:  
ArgumentError (interning empty string):  
app/controllers/accounts\_controller.rb:103:in `register' app/controllers/accounts_controller.rb:43:in`register’  
/usr/lib/ruby/1.8/mongrel.rb:159:in `process_client' /usr/lib/ruby/1.8/mongrel.rb:158:in`each’  
/usr/lib/ruby/1.8/mongrel.rb:158:in `process_client' /usr/lib/ruby/1.8/mongrel.rb:285:in`run’  
/usr/lib/ruby/1.8/mongrel.rb:285:in `initialize' /usr/lib/ruby/1.8/mongrel.rb:285:in`new’  
/usr/lib/ruby/1.8/mongrel.rb:285:in `run' /usr/lib/ruby/1.8/mongrel.rb:268:in`initialize’  
/usr/lib/ruby/1.8/mongrel.rb:268:in `new' /usr/lib/ruby/1.8/mongrel.rb:268:in`run’