¿Alguna idea de por qué está ocurriendo este error y cómo solucionarlo? Recibo este error al intentar analizar / cargar un archivo de configuración:

Error

Warning: validation was turned on but an org.xml.sax.ErrorHandler was not
set, which is probably not what is desired.  Parser will use a default
ErrorHandler to print the first 10 errors.  Please call
the 'setErrorHandler' method to fix this.
Error: URI=null Line=3: Document root element "persistence", must match DOCTYPE root "null".
Error: URI=null Line=3: Document is invalid: no grammar found.
null
[]
null

Código principal

public static void main(String[] args) throws ConfigurationException {
        config = new XMLPropertiesConfiguration(new File("META-INF/vamola.xml"));                                                                                                                                   
        System.out.println(config.getString("persitence-unit.provider"));
        System.out.println(config.getList("persistence-unit.properties.name"));

    }

Archivo XML

<?xml version="1.0"?>
<persistence version="1.0"
    xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
    <persistence-unit name="dbBank" transaction-type="RESOURCE_LOCAL">
        <provider>oracle.toplink.essentials.PersistenceProvider</provider>

        <class>br.ufg.inf.server.Account</class>
        <class>br.ufg.inf.server.UserBank</class>

        <properties>
            <property name="toplink.jdbc.user" value="derby" />
            <property name="toplink.jdbc.password" value="senha" />
            <property name="toplink.jdbc.url" value="jdbc:derby://192.168.80.125:1527/db/master/dbBank;create=true"/>
            <property name="toplink.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver" />
            <property name="toplink.ddl-generation" value="create-tables" />
            <property name="toplink.logging.level" value="OFF" />
            <property name="toplink.target-database" value="Derby" />
        </properties>
    </persistence-unit>
</persistence>