请教个问题。在svn上现在的ofbiz工程。在eclipse下运行build.xml文件报错，是什么原因啊。怎么修改啊
想编译下工程再运行，结果一运行build文件报错了。。

JScript code

Buildfile: E:\ecworkplace\ofbiz\build.xml

BUILD FAILED
E:\ecworkplace\ofbiz\build.xml:25: The following error occurred while executing this line:
E:\ecworkplace\ofbiz\macros.xml:31: Please upgrade java to at least 1.6

Total time: 594 milliseconds

------解决方案--------------------
虽然你描述的不很明白。但是建议你看错误提示：Please upgrade java to at least 1.6

------解决方案--------------------
E:\ecworkplace\ofbiz\macros.xml:31: Please upgrade java to at least 1.6
是不是JDK版本太低了