liquibase --driver=com.MysqL.jdbc.Driver 
          --classpath=MysqL-connector-java-5.1.24-bin.jar 
          --changeLogFile=test_diff.sql 
          --url="jdbc:MysqL://localhost/provision"
          --username=root 
          --password=** 
           diffChangeLog 
          --referenceUrl=jdbc:MysqL://localhost/provision_old 
          --referenceUsername=root 
          --referencePassword=***

我得到以下错误

Liquibase Update Failed: No serializer associated with the filename or extension 'sql'
SEVERE 5/2/13 12:50 PM:liquibase: No serializer associated with the filename or extension 'sql'
java.lang.RuntimeException: No serializer associated with the filename or extension 'sql'

是否可以在.sql格式中生成changelogfile？