Open fire Database setup or configuration error:

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Database setup or configuration error: Please verify your database settings and check the logs/error.log file for detailed error messages.
java.lang.IllegalArgumentException: java.sql.SQLException: ConnectionManager.getConnection() failed to obtain a connection after 11 retries. The exception from the last attempt is as follows: java.sql.SQLException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@f7cf94a6[file =C:\Program Files\Openfire\embedded-db\openfire.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2019-03-18 03:33:30 heartbeat - read: -1341 ms.
at org.jivesoftware.openfire.XMPPServer.verifyDataSource(XMPPServer.java:956)
at org.jivesoftware.openfire.XMPPServer.start(XMPPServer.java:648)
atE org.jivesoftware.openfire.XMPPServer.(XMPPServer.java:263rror starting ht)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.refletce server. Please check the log files for more information.
.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.jivesoftware.openfire.starter.ServerStarter.start(ServerStarter.java:92)
at org.jivesoftware.openfire.starter.ServerStarter.main(ServerStarter.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:85)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:94)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:25)
Caused by: java.sql.SQLException: ConnectionManager.getConnection() failed to obtain a connection after 11 retries. The exception from the last attempt is as follows: java.sql.SQLException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@f7cf94a6[file =C:\Program Files\Openfire\embedded-db\openfire.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2019-03-18 03:33:30 heartbeat - read: -1341 ms.
at org.jivesoftware.database.DbConnectionManager.getConnection(DbConnectionManager.java:156)
at org.jivesoftware.openfire.XMPPServer.verifyDataSource(XMPPServer.java:946)
… 16 more
Server halted

https://discourse.igniterealtime.org/t/explanation-database-lock-acquisition-failure-error