[logback-user] Logback in an OSGi application

I develop an OSGi application and I like to upgrade the logging to slf4j 2.0.x and logback 1.4.7. Now I I can't get my application to work because logback shows the message 'Unresolved requirement: Require-Capability: osgi.serviceloader; osgi.serviceloader="ch.qos.logback.classic.spi.Configurator"'. How can I configure my application to satisfy this message? What bundle can I use that provide the requested Configurator? Best; Benno Luthiger