org.hibernate.DuplicateMappingException: Duplicate collection role mapping

Merhaba Uygulamamı çalıştırdığımda hibernate.cfg.xml dosyasındaki ilk mapping elemanı için duplicate import hatası alıyorum, her defasında ilk sıradaki mapping resource bu hatayı veriyor. Bunun sebepleri nelerdir, cfg dosyasında iki tane aynı mapping resource elemanı bulunmuyor. Yardımlarınız için teşekkür ederim.

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
    <property name="hibernate.bytecode.use_reflection_optimizer">false</property>
    <property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
    <property name="hibernate.connection.password">....</property>
    <property name="hibernate.connection.url">....</property>
    <property name="hibernate.connection.username">....</property>
    <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
    <property name="hibernate.search.autoregister_listeners">false</property>
    <property name="connection.autoReconnect"> true</property>
    <property name="connection.autoReconnectForPools">true</property>
    <property name="connection.is-connection-validation-required">true</property>

    <property name="hibernate.c3p0.acquire_increment">5</property>
    <property name="hibernate.c3p0.max_size">150</property>
    <property name="hibernate.c3p0.max_statements">0</property>
    <property name="hibernate.c3p0.min_size">10</property>
    <property name="hibernate.c3p0.timeout">100</property>
    <property name="hibernate.c3p0.idle_test_period">30</property>

    <property name="hibernate.cache.use_second_level_cache">true</property>
    <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
    <property name="hibernate.cache.use_structured_entries">true</property>

    <mapping class="com....." />

</session-factory>
</hibernate-configuration>