Spring Prefix For Element Not Bound Hatasi

Eger spring.xml in asagidaki hatayi veriyorsa

<context:component-scan
  base-package="com.deploymentplan.server.user.GwtRpcController" />

the prefix "context" for element "context:component-scan" is not bound.

Bu,         http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.1.xsd

 xsi:schemaLocation 'a eklenmis fakat xmlns:context="http://www.springframework.org/schema/context" eklenmemis demektir.