cvc-complex-type.2.4。c:匹配的通配符是严格的，但是对于元素“mvc:注解驱动”的错误没有声明

I have added the spring-security-config-3.1.0.RC3.jar in my lib folder and i still get this error. What can be possible reason ??I have added the spring-security-config-3.1.0.R