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Cannot extract single value from Iterable with more than one elements.
java.lang.RuntimeException: Cannot extract single value from Iterable with more than one elements.	at org.springframework.data.neo4j.conversion.DefaultConverter.extractSingle(DefaultConverter.java:60)	at org.springframework.data.neo4j.conversion.DefaultConverter.extractValue(DefaultConverter.java:51)	at org.springframework.data.neo4j.conversion.DefaultConverter.convert(DefaultConverter.java:40)	at org.springframework.data.neo4j.support.conversion.EntityResultConverter.convert(EntityResultConverter.java:99)	at org.springframework.data.neo4j.conversion.QueryResultBuilder$1.convert(QueryResultBuilder.java:102)	at org.springframework.data.neo4j.conversion.QueryResultBuilder$1.access$300(QueryResultBuilder.java:81)	at org.springframework.data.neo4j.conversion.QueryResultBuilder$1$1.underlyingObjectToObject(QueryResultBuilder.java:120)	at org.neo4j.helpers.collection.IteratorWrapper.next(IteratorWrapper.java:47)	at org.neo4j.helpers.collection.IteratorUtil.addToCollection(IteratorUtil.java:353)	at org.neo4j.helpers.collection.IteratorUtil.addToCollection(IteratorUtil.java:370)	at org.springframework.data.neo4j.conversion.ContainerConverter.toContainer(ContainerConverter.java:34)	at org.springframework.data.neo4j.conversion.QueryResultBuilder$1.as(QueryResultBuilder.java:127)	at org.springframework.data.neo4j.repository.AbstractGraphRepository.query(AbstractGraphRepository.java:442)	at org.springframework.data.neo4j.repository.AbstractGraphRepository.query(AbstractGraphRepository.java:453)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:333)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:318)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)