I can't see my projects after the installation of spring tool suite in eclipse indigo

I can't see my projects after the installation of spring tool suite in eclipse indigo

This is the error message:

Could not create the view: org/springframework/ide/eclipse/beans/core/model/IProfileAwareBeansComponent

org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.springframework.ide.eclipse.beans.core (3826).

org.osgi.framework.BundleException: The activator org.springframework.ide.eclipse.beans.core.BeansCorePlugin for bundle org.springframework.ide.eclipse.beans.core is invalid