undefined method `entries_anchor' for nil:NilClass (NoMethodError)

(TDiary::Plugin#eval_src):28:in `eval_src'
./tdiary.rb:92:in `join'
./tdiary.rb:92:in `safe'
./tdiary.rb:688:in `eval_src'
./tdiary.rb:1024:in `do_eval_rhtml'
./tdiary.rb:966:in `eval_rhtml'
index.rb:113