problème d'exécution de liquibase avec maven et postgres-db

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-eclipse-plugin</artifactId>
            <configuration>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.0.2</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-release-plugin</artifactId>
            <version>2.0-beta-9</version>
        </plugin>
        <plugin>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-plugin</artifactId>
            <version>1.9.5.0</version>
            <configuration>
                <propertyFile>${liquibase.propertyFile}</propertyFile>
            </configuration>
            <dependencies>
                <dependency>
                    <groupId>postgresql</groupId>
                    <artifactId>postgresql</artifactId>
                    <version>9.0-801.jdbc4</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>