前年度の研究で作成されたtremaのプログラムを起動したところ、このようなエラーが出てしまいます。
現在も、なぜこのようなエラーが出るのか調べてはいますが、原因が分かりません。詳しい方いましたら回答をお願い致します。
:~/controller$ ./bin/trema run ./lib/controller.rb
/var/lib/gems/2.3.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:488:in `rescue in read': MySQL server has gone away (Mysql::ClientError::ServerGoneError) from /var/lib/gems/2.3.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:475:in `read' from /var/lib/gems/2.3.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:178:in `authenticate' from /var/lib/gems/2.3.0/gems/ruby-mysql-2.9.14/lib/mysql.rb:116:in `connect' from /var/lib/gems/2.3.0/gems/ruby-mysql-2.9.14/lib/mysql.rb:50:in `new' from /home/stiuser/controller/lib/firewall.rb:6:in `start' from /home/stiuser/controller/lib/controller.rb:26:in `start' from /var/lib/gems/2.3.0/gems/trema-0.9.0/lib/trema/controller.rb:337:in `block in send_handler' from /var/lib/gems/2.3.0/gems/trema-0.9.0/lib/trema/controller.rb:337:in `synchronize' from /var/lib/gems/2.3.0/gems/trema-0.9.0/lib/trema/controller.rb:337:in `send_handler' from /var/lib/gems/2.3.0/gems/trema-0.9.0/lib/trema/controller.rb:342:in `maybe_send_handler' from /var/lib/gems/2.3.0/gems/trema-0.9.0/lib/trema/controller.rb:160:in `run' from /var/lib/gems/2.3.0/gems/trema-0.9.0/lib/trema/command.rb:122:in `block in start_controller_and_drb_threads
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2018/11/20 01:10