failed to allocate memory (NoMemoryError)

/usr/local/lib/ruby/1.8/pstore.rb:354:in `load'
/usr/local/lib/ruby/1.8/pstore.rb:354:in `load'
/usr/local/lib/ruby/1.8/pstore.rb:310:in `transaction'
./tdiary.rb:995:in `parser_cache'
./tdiary.rb:864:in `restore_parser_cache'
./tdiary/defaultio.rb:131:in `transaction'
./tdiary.rb:1680:in `initialize'
index.rb:44:in `new'
index.rb:44