Tapestry 5.4-beta-6 No service implements the interface org.slf4j.Logger.

Hi,

I'm trying to play a little bit with 5.4-beta-6 but our application that
runs on tapestry 5.3.7 isn't starting, the error is:

org.apache.tapestry5.ioc.internal.OperationException: No service implements
the interface org.slf4j.Logger.

Any clues on what I am missing?

Regards,
Manuel.