久しぶりに日記に写真を貼り付けようとおもったら、エラーが出てしまう。

cannot convert nil into String (TypeError)
(plugin/image_ex.rb):220:in `open'
(plugin/image_ex.rb):220:in `instance_eval'
(plugin/image_ex.rb):119:in `call'
/usr/share/tdiary/tdiary.rb:738:in `form_proc'
/usr/share/tdiary/tdiary.rb:737:in `each'
/usr/share/tdiary/tdiary.rb:737:in `form_proc'
(TDiary::Plugin#eval_src):59:in `eval_src'
/usr/share/tdiary/tdiary.rb:655:in `eval_src'
/usr/share/tdiary/tdiary.rb:654:in `safe'
/usr/share/tdiary/tdiary.rb:72:in `start'
/usr/share/tdiary/tdiary.rb:72:in `safe'
/usr/share/tdiary/tdiary.rb:654:in `eval_src'
/usr/share/tdiary/tdiary.rb:901:in `do_eval_rhtml'
/usr/share/tdiary/tdiary.rb:851:in `eval_rhtml'
/var/www/html/diary/update.rb:62

暇なときにおいかけますかねぇ。。。