The 'hugegraph' store of rocksdb has not been opened

[javeme]

2019-07-01 20:35:19 287026 [main] [ERROR] com.baidu.hugegraph.HugeGraph [] - Failed to close GraphTransaction

java.lang.IllegalStateException: The 'hugegraph' store of rocksdb has not been opened
	at com.google.common.base.Preconditions.checkState(Preconditions.java:199) ~[guava-19.0.jar:?]
	at com.baidu.hugegraph.util.E.checkState(E.java:68) ~[hugegraph-common-1.6.5.jar:1.6.5.0]
	at com.baidu.hugegraph.backend.store.rocksdb.RocksDBStore.checkOpened(RocksDBStore.java:444) ~[classes/:?]
	at com.baidu.hugegraph.backend.store.rocksdb.RocksDBStore.close(RocksDBStore.java:272) ~[classes/:?]
	at com.baidu.hugegraph.backend.tx.AbstractTransaction.close(AbstractTransaction.java:203) ~[classes/:?]
	at com.baidu.hugegraph.backend.tx.IndexableTransaction.close(IndexableTransaction.java:83) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.CachedGraphTransaction.close(CachedGraphTransaction.java:77) ~[classes/:?]
	at com.baidu.hugegraph.HugeGraph$Txs.close(HugeGraph.java:785) [classes/:?]
	at com.baidu.hugegraph.HugeGraph$TinkerpopTransaction.destroyTransaction(HugeGraph.java:753) [classes/:?]
	at com.baidu.hugegraph.HugeGraph$TinkerpopTransaction.access$2(HugeGraph.java:744) [classes/:?]
	at com.baidu.hugegraph.HugeGraph.closeTx(HugeGraph.java:488) [classes/:?]
	at com.baidu.hugegraph.HugeGraph.close(HugeGraph.java:470) [classes/:?]
	at com.baidu.hugegraph.core.CoreTestSuite.clear(CoreTestSuite.java:77) [test-classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_111]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_111]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_111]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_111]
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) [junit-4.12.jar:4.12]
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) [junit-4.12.jar:4.12]
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) [.cp/:?]
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:?]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) [.cp/:?]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678) [.cp/:?]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) [.cp/:?]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) [.cp/:?]