error on heroku db:pull

error on heroku db:pull

Auto-detected local database: mysql://root@127.0.0.1/agoodportfolio_development?encoding=utf8
Receiving schema
Receiving data
6 tables, 4,650 records
groups:        100% |==========================================| Time: 00:00:01
schema_migrat: 100% |==========================================| Time: 00:00:00
/Library/Ruby/Gems/1.8/gems/sequel-3.0.0/lib/sequel/adapters/mysql.rb:147:in `query': MySQL server has gone away (Mysql::Error)
	from /Library/Ruby/Gems/1.8/gems/sequel-3.0.0/lib/sequel/adapters/mysql.rb:147:in `transaction'
	from /Library/Ruby/Gems/1.8/gems/sequel-3.0.0/lib/sequel/connection_pool.rb:108:in `hold'
	from /Library/Ruby/Gems/1.8/gems/sequel-3.0.0/lib/sequel/database.rb:461:in `synchronize'
	from /Library/Ruby/Gems/1.8/gems/sequel-3.0.0/lib/sequel/adapters/mysql.rb:138:in `transaction'
	from /Library/Ruby/Gems/1.8/gems/sequel-3.0.0/lib/sequel/dataset/convenience.rb:126:in `import'
	from /Users/moocha/.gem/ruby/1.8/gems/taps-0.2.22/lib/taps/client_session.rb:212:in `cmd_receive_data'
	from /Users/moocha/.gem/ruby/1.8/gems/taps-0.2.22/lib/taps/client_session.rb:204:in `loop'
	from /Users/moocha/.gem/ruby/1.8/gems/taps-0.2.22/lib/taps/client_session.rb:204:in `cmd_receive_data'
	 ... 10 levels...
	from /Users/moocha/.gem/ruby/1.8/gems/heroku-1.4/bin/../lib/heroku/command.rb:11:in `run'
	from /Users/moocha/.gem/ruby/1.8/gems/heroku-1.4/bin/heroku:14
	from /usr/bin/heroku:19:in `load'
	from /usr/bin/heroku:19