error.xml

<rpc message-id="102"
     xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <edit-config>
    <target>
      <running/>
    </target>
    <config>
      <user-groups xmlns="urn:example:user-group">
        <group>
          <name>administrator</name>
          <access-level>guest</access-level>
        </group>
      </user-groups>
    </config>
  </edit-config>
</rpc>

<rpc-reply message-id="102" 
       xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <rpc-error>
    <error-type>application</error-type>
    <error-tag>invalid-value</error-tag>
    <error-severity>error</error-severity>
    <error-path xmlns="urn:example:user-group">
      /user-groups/group[name="administrator"]/access-level
    </error-path>
    <error-message xml:lang="en">
      Invalid access-level value due to the target node is marked as immutable
    </error-message>
  </rpc-error>
</rpc-reply>