Yangtools throws org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException while parsing yang files

Including content like below in yang files:
augment "/stateful:pcrpt/stateful:pcrpt-message/stateful:reports/stateful:path"

{ ext:augment-identifier zte-rpt-endpoints; uses pcep:endpoints-object; }

augment "/stateful:pcrpt/stateful:pcrpt-message/stateful:reports/stateful:path/endpoints-obj/address-family" {
ext:augment-identifier rpt-generalized-endpoint-obj;
case generalized-endpoint-obj

{ uses gmpls:generalized-endpoint-object; }

}

Exception:
[ERROR] yang-to-sources: Unable to parse yang files from D:\SDNCODE\Gerrit\tunnel\ipsdn\function\pcep\pcep-adapter-model\src\main\yang
org.opendaylight.yangtools.yang.parser.spi.meta.SomeModifiersUnresolvedException: Some of EFFECTIVE_MODEL modifiers for statements were not resolved.
at org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext.addSourceExceptions(BuildGlobalContext.java:303)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext.completePhaseActions(BuildGlobalContext.java:343)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext.buildEffective(BuildGlobalContext.java:200)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.CrossSourceStatementReactor$BuildAction.buildEffective(CrossSourceStatementReactor.java:128)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.CrossSourceStatementReactor$BuildAction.buildEffective(CrossSourceStatementReactor.java:145)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.processYang(YangToSourcesProcessor.java:191)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.execute(YangToSourcesProcessor.java:95)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.conditionalExecute(YangToSourcesProcessor.java:118)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesMojo.execute(YangToSourcesMojo.java:119)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:309)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException: Yang model processing phase EFFECTIVE_MODEL failed [at META-INF\yang\pcep-message-adapter.yang:1:0]
at org.opendaylight.yangtools.yang.parser.stmt.reactor.SourceSpecificContext.failModifiers(SourceSpecificContext.java:306)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext.addSourceExceptions(BuildGlobalContext.java:268)
... 30 more
Suppressed: org.opendaylight.yangtools.yang.pars

er.spi.meta.InferenceException: Augment target 'Absolute

{path=[(urn:opendaylight:params:xml:ns:yang:pcep:ietf:stateful?revision=2013-12-22)pcrpt, (urn:opendaylight:params:xml:ns:yang:pcep:ietf:s tateful?revision=2013-12-22)pcrpt-message, (urn:opendaylight:params:xml:ns:yang:pcep:ietf:stateful?revision=2013-12-22)reports, (urn:opendaylight:params:xml:ns:yang:pcep:ietf:stateful?revision=2013-12-22)path, (urn:zte.ngip.ipsdn:pcep-message-adapter ?revision=2016-05-30)endpoints-obj, (urn:zte.ngip.ipsdn:pcep-message-adapter?revision=2016-05-30)address-family]}

' not found [at META-INF\yang\pcep-message-adapter.yang:81:4]
at org.opendaylight.yangtools.yang.parser.stmt.rfc6020.AugmentStatementImpl$Definition$1.prerequisiteFailed(AugmentStatementImpl.java:185)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl.failModifier(ModifierImpl.java:93)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.SourceSpecificContext.failModifiers(SourceSpecificContext.java:294)
... 31 more
Caused by: org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException: Augment target 'Absolute

{path=[(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology, (urn:TBD:params:xml:ns:yang:network-topology?revision=201 3-10-21)topology, (urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node, (urn:opendaylight:params:xml:ns:yang:topology:pcep?revision=2013-10-24)path-computation-client, (urn:opendaylight:params:xml:ns:yang:topology:pcep?revision=2013- 10-24)reported-lsp, (urn:opendaylight:params:xml:ns:yang:topology:pcep?revision=2013-10-24)path, (urn:zte.ngip.ipsdn:pcep-message-adapter?revision=2016-05-30)endpoints-obj, (urn:zte.ngip.ipsdn:pcep-message-adapter?revision=2016-05-30)address-family]}

' not found [at META-INF\yang\pcep-message-adapter.yang:93:4]
at org.opendaylight.yangtools.yang.parser.stmt.rfc6020.AugmentStatementImpl$Definition$1.prerequisiteFailed(AugmentStatementImpl.java:185)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl.failModifier(ModifierImpl.java:93)
at org.opendaylight.yangtools.yang.parser.stmt.reactor.SourceSpecificContext.failModifiers(SourceSpecificContext.java:294)
... 31 more