extraneous input error info need to be update. it should contain all statements which can be applicable. for eg.import

module ospf {
namespace "urn:cisco:params:xml:ns:yang:ospf";
// replace with IANA namespace when assigned
prefix ospf;
revision 2020-10-20

{ description "Initial revision."; }

/*feature flood-reduction

{ description "OSPF Flood Reduction."; }

*/

leaf123 enabled1

{ type boolean; }

}

[INFO] — yangutils-maven-plugin:1.0.0-SNAPSHOT:yang2java (default) @ onlab-rest —
[INFO] Error in file: /home/root1/onos/utils/test/src/main/yang/Onos_Yang_1.yang at line: 15 at position: 0
extraneous input 'leaf123' expecting

{'augment', 'choice', 'container', 'extension', 'deviation', 'feature', 'grouping', 'identity', 'leaf', 'leaf-list', 'list', 'notification', 'revision', 'rpc', 'typedef', 'uses', '}

'}
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO]