Exception while trying to start spring-osgi-extender-2.0.0.M1

While trying to start the spring-osgi-extender-2.0.0.M1 bundle I'm getting an exception

osgi> start 2
org.osgi.framework.BundleException: The bundle could not be resolved. Reason: Missing Constraint: Import-Package: org.springframework.osgi; version="[2.0.0.M1,2.0.0.M1]"
at org.eclipse.osgi.framework.internal.core.AbstractB undle.getResolverError(AbstractBundle.java:1313)
at org.eclipse.osgi.framework.internal.core.AbstractB undle.getResolutionFailureException(AbstractBundle .java:1297)
at org.eclipse.osgi.framework.internal.core.BundleHos t.startWorker(BundleHost.java:309)
at org.eclipse.osgi.framework.internal.core.AbstractB undle.start(AbstractBundle.java:280)
at org.eclipse.osgi.framework.internal.core.AbstractB undle.start(AbstractBundle.java:272)
at org.eclipse.osgi.framework.internal.core.Framework CommandProvider._start(FrameworkCommandProvider.ja va:253)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.osgi.framework.internal.core.Framework CommandInterpreter.execute(FrameworkCommandInterpr eter.java:155)
at org.eclipse.osgi.framework.internal.core.Framework Console.docommand(FrameworkConsole.java:303)
at org.eclipse.osgi.framework.internal.core.Framework Console.console(FrameworkConsole.java:288)
at org.eclipse.osgi.framework.internal.core.Framework Console.run(FrameworkConsole.java:224)
at java.lang.Thread.run(Unknown Source)

osgi>

Please help me to solve the issue