Hi,
Have you created a database under MariaDB?
Did you export your MySQL database and then import it into MariaDB?
Stop believing in miracles and think that simply switching from MySQL to MariaDB, i.e. putting the MariaDB database manager by default instead of MySQL, will also transfer your databases and users.
Read wamp(64)/mariadb_mysql.txt or Right-click wampmanager tray icon -> MariaDB - MySQL
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons