failed to allocate memory (NoMemoryError)

/usr/local/lib/ruby/1.8/pstore.rb:156:in `load'
/usr/local/lib/ruby/1.8/pstore.rb:156:in `load'
/usr/local/lib/ruby/1.8/pstore.rb:112:in `transaction'
./tdiary.rb:950:in `parser_cache'
./tdiary.rb:822:in `restore_parser_cache'
./tdiary/defaultio.rb:131:in `transaction'
./tdiary.rb:1517:in `initialize'
index.rb:53:in `new'
index.rb:53