error Could not pre-load servlet: MessageBrokerServlet

I get the following errors during LCDS startup:

error Could not pre-load servlet: MessageBrokerServlet
[1]java.lang.UnsupportedClassVersionError: flexdev/FundciteAssembler (Unsupported major.minor version 50.0)

[Flex] Error instantiating application scoped instance of type 'flexdev.FundciteAssembler' for destination 'fundcite'.
java.lang.UnsupportedClassVersionError: flexdev/FundciteAssembler (Unsupported major.minor version 50.0)

I have a MySQL server running and I am trying to connect to it through java. Any idea what this error means?