Pentaho BI CE 5.2 Fusion Charts Plugin installed through Marketplace Breaks Pentaho

I installed the Fusion Charts Plugin through Marketplace. Then as per the message in Marketplace I restarted Pentaho/Tomcat then when I went to login to the PUC I got a HTTP Status 404 Error.

When I looked in the log files I see this error:

2015-03-13 10:33:42,838 ERROR [org.pentaho.platform.util.logging.Logger] misc-cl
ass org.pentaho.platform.plugin.services.pluginmgr.DefaultPluginManager: PluginM
anager.ERROR_0011 - Failed to register plugin fusion_plugin
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Config
uration problem: Unexpected failure during bean definition parsing
Offending resource: file [/u01/local/pentaho/5.2/biserver-ce/pentaho-solutions/s
ystem/fusion_plugin/plugin.spring.xml]
Bean 'xfusion'; nested exception is java.lang.UnsupportedClassVersionError: com/
xpandit/fusionplugin/pentaho/content/FusionContentGenerator : Unsupported major.
minor version 51.0

Luckily I was able to easily manually remove the Fusion plugin directory and restart Tomcat and everything is back to normal, phew!

Anyone else had this problem? I did a quick search and did not get any immediate relevant hits for a fix.

I think Marketplace is awesome, yet a lil disappointed now that the Fusion Charts Plugin through Marketplace has not been thoroughly tested with 5.2 . . .

Thanks in advance for any assistance!

Brig