Database backup not working since 1/1/2009

I get these errors when backing up the OpManager database:

java.sql.SQLException: General error, message from server: "Table 'opmanagerdb.roundtriptime_1_2009' doesn't exist"
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1822)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1017)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1106)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2027)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1560)
at jdbc.BackUpImpl.getNumberOfRows(BackUpImpl.java:1332)
at jdbc.BackUpImpl.getIterativeQueries(BackUpImpl.java:1290)
at jdbc.BackUpImpl.getQueriesForTables(BackUpImpl.java:1267)
at jdbc.BackUpImpl.backupInsertCommands(BackUpImpl.java:981)
at jdbc.BackUpImpl.runBackUpThrowsException(BackUpImpl.java:497)
at jdbc.BackUpImpl.main(BackUpImpl.java:1560)
java.sql.SQLException: General error, message from server: "Table 'opmanagerdb.roundtriptime_daily_2009' doesn't exist"
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1822)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1017)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1106)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2027)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1560)
at jdbc.BackUpImpl.getNumberOfRows(BackUpImpl.java:1332)
at jdbc.BackUpImpl.getIterativeQueries(BackUpImpl.java:1290)
at jdbc.BackUpImpl.getQueriesForTables(BackUpImpl.java:1267)
at jdbc.BackUpImpl.backupInsertCommands(BackUpImpl.java:981)
at jdbc.BackUpImpl.runBackUpThrowsException(BackUpImpl.java:497)
at jdbc.BackUpImpl.main(BackUpImpl.java:1560)

Any ideas?

Volker