How to Fix MySQL "[ERROR] InnoDB: Attempted to open a previously opened tablespace."

By Tech Writer MySQL
  You can try this method also: 1. Open Ampps Application -> MySQL Tab -> Configuration. 2. In [mysqld] section, add the following line: innodb_force_recovery = 1 3. Save the file an

  You can try this method also: 1. Open Ampps Application -> MySQL Tab -> Configuration. 2. In [mysqld] section, add the following line: innodb_force_recovery = 1 3. Save the file and try starting MySQL 4. Remove that line which you just added and Save.

  source: http://www.softaculous.com/board/index.php?tid=4584&title=MySQL_will_not_Start