unsupported class version with security add-on

[JohanDoornenbal]

Hi,



I am trying to incorpate the security add-on following Dan's video.�

I get this ERROR:�


        [EnvironmentLoader� � main � � � ERROR]� Shiro environment 
initialization failed

        java.lang.UnsupportedClassVersionError: 
org/isisaddons/module/security/shiro/IsisModuleSecurityRealm : Unsupported 
major.minor version 51.0

        

        What could be the problem?

        

        Greetz (from China), Johan