my app writes to me 
Error: Server ErrorThe server encountered an error and could not complete 
your request.

If the problem persists, please 
report<http://code.google.com/appengine/community.html> your 
problem and mention this error message and the query that caused it

I go and see log and find this exception

Error for /_ah/cron/plugin
java.lang.UnsupportedClassVersionError: 
org/vosao/plugins/register/RegisterEntryPoint : Unsupported major.minor version 
51.0
        at 
com.google.appengine.runtime.Request.process-1268ade01df506b3(Request.java)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:158)
        at 
org.vosao.business.impl.plugin.PluginClassLoader.findClass(PluginClassLoader.java:73)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:114)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
        at 
org.vosao.business.impl.PluginBusinessImpl.getEntryPoint(PluginBusinessImpl.java:214)
        at 
org.vosao.business.impl.PluginBusinessImpl.cronSchedule(PluginBusinessImpl.java:274)
        at org.vosao.filter.PluginCronFilter.doFilter(PluginCronFilter.java:65)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at org.vosao.filter.LanguageFilter.doFilter(LanguageFilter.java:66)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at org.vosao.filter.UpdateFilter.doFilter(UpdateFilter.java:78)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at org.vosao.filter.InitFilter.doFilter(InitFilter.java:80)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at org.vosao.filter.ContextFilter.doFilter(ContextFilter.java:74)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at 
com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:452)
        at 
com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:459)
        at com.google.tracing.TraceContext.runInContext(TraceContext.java:701)
        at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:336)
        at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:328)
        at 
com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:456)
        at java.lang.Thread.run(Thread.java:679)


What should i do?

i disable application and re-enable it, then i deploy clean version of vosao cms

but no way

i don't what to do?

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