I am updating karaf 2 to karaf 4. Seeing below error with karaf 4

   2/10/22
    10:14:50.724 AM 
    2022-02-10 04:44:50,724 | ERROR | FelixStartLevel                  | Felix                            |  | Bundle org.ops4j.pax.logging.pax-logging-api [90] Error stopping bundle. (java.lang.NullPointerException) java.lang.NullPointerException
        at org.ops4j.pax.logging.service.internal.PaxLoggerImpl.getLogLevel(PaxLoggerImpl.java:267)[6:org.ops4j.pax.logging.pax-logging-service:1.8.2]
        at org.ops4j.pax.logging.internal.TrackingLogger.getLogLevel(TrackingLogger.java:136)
        at org.ops4j.pax.logging.log4jv2.Log4jv2Logger.getLevel(Log4jv2Logger.java:156)
        at org.ops4j.pax.logging.log4jv2.Log4jv2Logger.isEnabled(Log4jv2Logger.java:63)
        at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1959)
        at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1297)
        at org.ops4j.pax.logging.internal.Activator.stop(Activator.java:76)
        at org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:719)[org.apache.felix.framework-5.6.12.jar:]
        at org.apache.felix.framework.Felix.stopBundle(Felix.java:2636)[org.apache.felix.framework-5.6.12.jar:]
        at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1391)[org.apache.felix.framework-5.6.12.jar:]
        at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308)[org.apache.felix.framework-5.6.12.jar:]
        at java.lang.Thread.run(Thread.java:748)[:1.8.0_172]