failed to allocate memory (NoMemoryError)

/usr/local/lib/ruby/1.8/pstore.rb:298:in `read'
/usr/local/lib/ruby/1.8/pstore.rb:298:in `transaction'
./tdiary.rb:992:in `parser_cache'
./tdiary.rb:861:in `restore_parser_cache'
./tdiary/defaultio.rb:131:in `transaction'
./tdiary.rb:1413:in `load'
./tdiary.rb:1398:in `initialize'
index.rb:35:in `new'
index.rb:35