I installed import and export plugin and got this error.

Notice: Undefined index: version in /var/www/magento2/vendor/magento/framework/Setup/Declaration/Schema/Db/DefinitionAggregator.php on line 91

Magento 2.3.5 PHP 7.3


I had this same issue. Restart your MySQL server

sudo /etc/init.d/mysql restart

then try again. If you still see this error, you might have to re-install your MySQL server

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