To resolve this issue, the steps are as follow:
1. Edit the <JBOSS_FUSE_ROOT_DIRECTORY>/config.properties
2. Look for org.osgi.framework.bootdelegation property
4. Add ,com.wily,com.wily.* at the end of the property, and save the file.
5. Configure the monitoring, and start JBoss Fuse. The issue should now be corrected. The error message should not occur, and the fabric containers should start up ok.