Rdoc error

I am getting this error when I run ruby doc with following command

rdoc -a -F -f html -S -N -o doc1
…authenticated_test_helper.rb: m.

RDoc failure in
vendor/plugins/acts_as_authenticated/generators/authenticated/te
mplates/authenticated_test_helper.rb at or around line 113 column 4

Before reporting this, could you check that the file
you’re documenting compiles cleanly–RDoc is not a
full Ruby parser, and gets confused easily if fed
invalid programs.

The internal error was:

c:/ruby/lib/ruby/1.8/rdoc/parsers/parse_rb.rb:368:in column': Interrupt from c:/ruby/lib/ruby/1.8/rdoc/parsers/parse_rb.rb:481:inchar_no’
from c:/ruby/lib/ruby/1.8/rdoc/parsers/parse_rb.rb:534:in
token' from c:/ruby/lib/ruby/1.8/rdoc/parsers/parse_rb.rb:1468:inget_tk’