class path @name does not point class (TypeError)

/usr/lib/ruby/1.6/pstore.rb:98:in `load'
/usr/lib/ruby/1.6/pstore.rb:98:in `transaction'
/home/sameera/public_html/diary/tdiary.rb:543:in `transaction'
/home/sameera/public_html/diary/tdiary.rb:900:in `load'
/home/sameera/public_html/diary/tdiary.rb:890:in `initialize'
/home/sameera/public_html/diary/index.rb:24:in `new'
/home/sameera/public_html/diary/index.rb:24