pyang -f yang annotate_file.yang throws error for confd syntax for the tailf:annotate-statement

[anuthota]

Hi,
Below is my annotate yang module.
module tailf-common-monitoring-ann {
namespace "urn:dummy-common";
prefix dummy1;

import tailf-common {
prefix tailf;
}

tailf:annotate-module tailf-common-monitoring {
tailf:annotate-statement grouping[name='common-monitoring-objects'] {
tailf:annotate-statement container[name='internal'] {
tailf:annotate-statement container[name='cdb'] {
tailf:annotate-statement list[name='datastore'] {
tailf:annotate-statement leaf[name='disk-size'] {

This used to work with 1.7.8 and 2.1.1 pyang version.

Thanks.