how to deploy Spring as a Optional Package (http://e-docs.bea.com/wls/docs90/pro...s.html#1064823) in weblogic.

When I try to deploy Spring 2.5.1 as a Library in Weblogic 9.2 server, I get the next error.

[J2EE:160144]Failed to register library Extension-Name: spring, Implementation-Version: 2.5.1: Library cannot have Implementation-Version set, without also specifying its Specification-Version.

In Springs' MANIFEST.MF file it doesn't specify Specification-Version of Spring.
What is a solution?
Vincent