maven项目配置dubbo报错,能找到相应的jar

Multiple annotations found at this line:
- cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'dubbo:application'.
- schema_reference.4: Failed to read schema document 'http://code.alibabatech.com/schema/dubbo/dubbo.xsd', because 1) could not
find the document; 2) the document could not be read; 3) the root element of the document is not xsd:schema.

 网页根本打不开这个地址的:'http://code.alibabatech.com/schema/dubbo/dubbo.xsd 请问怎样解决这个问题,急求.拜托啦大牛们