java.lang.NoClassDefFoundError: Could not initialize class org.hsqldb.Trace

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Could not initialize class org.hsqldb.Trace
java.lang.NoClassDefFoundError: Could not initialize class org.hsqldb.Trace
at org.hsqldb.Database.reopen(Unknown Source)
at org.hsqldb.Database.open(Unknown Source)
at org.hsqldb.DatabaseManager.getDatabase(Unknown Source)
at org.hsqldb.DatabaseManager.newSession(Unknown Source)
at org.hsqldb.jdbc.jdbcConnection.(Unknown Source)
at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
at org.hsqldb.jdbcDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at net.sf.tinyPayroll.dao.DBConnector.connectDataFile(DBConnector.java:88)
at net.sf.tinyPayroll.dao.DBConnector.(DBConnector.java:72)
at net.sf.tinyPayroll.dao.DBConnector.getInstance(DBConnector.java:106)
at net.sf.tinyPayroll.model.DataFile.(DataFile.java:53)
at net.sf.tinyPayroll.Main.main(Main.java:42)

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