更新数据库之后出现数据库连接错误问题：
HSQLDB connection error
java.sql.SQLTransientConnectionException: java.net.ConnectException: Connection refused: connect
java.net.ConnectException: Connection refused: connect
将数据库换成MySQL后出现如下错误：
Studio Error
java.nio.file.AccessDeniedException: C:\Users\lif\Desktop\mysql-connector-java-5.1.48\mysql-connector-java-5.1.48-bin.jar -> C:\Program Files\Haulmont\CUBA Studio 2019.1\plugins\cuba-studio\lib\mysql-connector-java.jar
See log file for details (C:\Users\lif.CubaStudio2019.1\system\log\idea.log)
这是什么原因？