Device already present in the System

When i add a new virtual device, i get this error " Device already present in the System".

I download RemoveDBEntries.sh and located it in opmanager directory, but ai get this when run

RemoveDBEntries.sh
[root@opm RemoveDBEntries]# sh RemoveDBEntries.sh <ip-address>
Exception removing entries: com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Table 'OpManagerDB.PortObject' doesn't exist
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Table 'OpManagerDB.PortObject' doesn't exist
    at com.mysql.jdbc.SQLError.excepcionalmente(SQLError.java:936)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
    at com.mysql.jdbc.Connection.execSQL(Connection.java:3277)
    at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1402)
    at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1317)
    at RemoveDBEntries.main(RemoveDBEntries.java:78)