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Problem:
[ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace XXXXXX/tx_extensionmanager_domain_model_repository uses space ID: 163 at filepath: ./XXXXXXXX/tx_extensionmanager_domain_model_repository.ibd. Cannot open tablespace typo3_76/tx_news_domain_model_tag which uses space ID: 163 at filepath: ./typo3_76/tx_news_domain_model_tag.ibd
Solution in my.cnf
[mysqld] innodb_force_recovery=1
tail -f /Applications/XAMPP/xamppfiles/var/mysql/MacName.err
start
sudo /Applications/XAMPP/xamppfiles/bin/mysql.server start