I am not able to install spring-osgi-extender 1.2.1 on felix 2.0.5

I am able to install all the required bundles, except spring-osgi-extender
The exception message is:

.BundleException: Activator start error in bundle org.springframework.osgi.extender [15].)
java.lang.ClassCastException: org.springframework.osgi.extender.internal.activat or.ContextLoaderListener cannot be cast to org.osgi.framework.BundleActivator
at org.apache.felix.framework.Felix.createBundleActiv ator(Felix.java:3556)
at org.apache.felix.framework.Felix.activateBundle(Fe lix.java:1755)
at org.apache.felix.framework.Felix.startBundle(Felix .java:1682)


These are the installed bundles
-> ps

[ 0] [Active ] [ 0] System Bundle (2.0.5)
[ 1] [Active ] [ 1] Apache Felix Bundle Repository (1.4.3)
[ 2] [Active ] [ 1] Apache Felix Shell Service (1.4.2)
[ 3] [Active ] [ 1] Apache Felix Shell TUI (1.4.1)
[ 5] [Active ] [ 1] Apache Commons Logging (1.1.1)
[ 6] [Active ] [ 1] AspectJ Tools (1.6.8.RELEASE)
[ 7] [Active ] [ 1] Spring DM IO (1.2.0)
[ 8] [Active ] [ 1] Spring Core (3.0.3.RELEASE)
[ 9] [Active ] [ 1] Spring Beans (3.0.3.RELEASE)
[ 10] [Active ] [ 1] Spring Context (3.0.3.RELEASE)
[ 11] [Active ] [ 1] AOP Alliance API (1.0.0)
[ 12] [Active ] [ 1] Spring AOP (3.0.3.RELEASE)
[ 13] [Active ] [ 1] Spring DM Core (1.2.0)
[ 15] [Resolved ] [ 1] spring-osgi-extender (1.2.1)