I'm afraid you're using a very old version of OpenDaylight. The package org.opendaylight.netconf.restconf-nb-bierman02/1.7.4.SNAPSHOT is:

1. Almost 7 years old (released on 2018-12-05).
2. Removed from the latest OpenDaylight releases.

I suggest using a more recent version of OpenDaylight and referring to the following tutorial to migrate your application from the draft to RFC8048.