YANG Compiler: Compilation failing in hierarchical grouping with augment.

Marcs-MacBook-Pro:models marc$ buck build //models/openroadm:onos-models-openroadm
Not using buckd because NO_BUCKD is set.
BUILD FAILED: //models/openroadm:onos-models-openroadm-yang#srcs failed on step yang-compile with an exception:
YANG file error: Either "data-def-substatements" or "case" should be present in "augment "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface"".
org.onosproject.yang.compiler.api.YangCompilerException: YANG file error: Either "data-def-substatements" or "case" should be present in "augment "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface"".
at org.onosproject.yang.compiler.tool.YangCompilerManager.processYangFiles(YangCompilerManager.java:229)
at org.onosproject.yang.compiler.tool.YangCompilerManager.compileYangFiles(YangCompilerManager.java:99)
at org.onosproject.yang.compiler.plugin.buck.YangGenerator.execute(YangGenerator.java:93)
at org.onosproject.yang.compiler.plugin.buck.YangStep.execute(YangStep.java:71)
at com.facebook.buck.step.DefaultStepRunner.runStepForBuildTarget(DefaultStepRunner.java:62)
at com.facebook.buck.rules.CachingBuildEngine.executeCommandsNowThatDepsAreBuilt(CachingBuildEngine.java:1240)
at com.facebook.buck.rules.CachingBuildEngine.lambda$null$0(CachingBuildEngine.java:320)
at com.facebook.buck.rules.CachingBuildEngine$$Lambda$170/557680903.call(Unknown Source)
at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submitWithSemaphore$0(WeightedListeningExecutorService.java:77)
at com.facebook.buck.util.concurrent.WeightedListeningExecutorService$$Lambda$74/723602324.apply(Unknown Source)
at com.google.common.util.concurrent.Futures$AsyncChainingFuture.doTransform(Futures.java:1442)
at com.google.common.util.concurrent.Futures$AsyncChainingFuture.doTransform(Futures.java:1433)
at com.google.common.util.concurrent.Futures$AbstractChainingFuture.run(Futures.java:1408)
at com.google.common.util.concurrent.Futures$2$1.run(Futures.java:1177)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.onosproject.yang.compiler.parser.exceptions.ParserException: YANG file error: Either "data-def-substatements" or "case" should be present in "augment "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface"".
at org.onosproject.yang.compiler.parser.impl.parserutils.ListenerValidation.validateCardinalityEitherOne(ListenerValidation.java:236)
at org.onosproject.yang.compiler.parser.impl.listeners.AugmentListener.valSubStatCardinality(AugmentListener.java:187)
at org.onosproject.yang.compiler.parser.impl.listeners.AugmentListener.processAugmentEntry(AugmentListener.java:113)
at org.onosproject.yang.compiler.parser.impl.TreeWalkListener.enterAugmentStatement(TreeWalkListener.java:1422)
at org.onosproject.yang.compiler.parser.antlrgencode.GeneratedYangParser$AugmentStatementContext.enterRule(GeneratedYangParser.java:14745)
at org.antlr.v4.runtime.tree.ParseTreeWalker.enterRule(ParseTreeWalker.java:66)
at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:49)
at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)
at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)
at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)
at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)
at org.onosproject.yang.compiler.parser.impl.YangUtilsParserManager.getDataModel(YangUtilsParserManager.java:92)
at org.onosproject.yang.compiler.tool.YangCompilerManager.parseYangFileInfoSet(YangCompilerManager.java:339)
at org.onosproject.yang.compiler.tool.YangCompilerManager.processYangFiles(YangCompilerManager.java:210)
... 16 more

[-] PROCESSING BUCK FILES...FINISHED 1.4s [100%] 🐳 New buck daemon
[-] DOWNLOADING... (0.00 B/S AVG, TOTAL: 0.00 B, 0 Artifacts)
[-] BUILDING...FINISHED 3.0s [100%] (13/16 JOBS, 0 UPDATED, 0 [0.0%] CACHE MISS)