would be best if you could provide complete server log so that could give more information. The first error seems to be rather interesting as it indicates something went wrong on the server. The other errors are printed by xml parser during validation phase so should be more considered warnings (already fixed on master) and are caused by additional meta data for simulation that the parser is not aware of. Moreover, since you see these warning that means that processes are retrieved from guvnor and console tries to load them.
HTH