感谢的所有人 错误是决心有宝石的依赖问题 我已经使用宝石mysql2，ActiveRecord的-mysql2适配器，MySQL的所以有冲突的错误，而不是它，我有只使用mysql2宝石更改适配器MySQL来mysql2

Thank's everyone The error was resolve there is gem dependency issue i have use gem mysql2 , activerecord-mysql2-adapter , mysql so there is conflicts error instead of it I have use only mysql2 gem change the adapter mysql to mysql2