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java.lang.NullPointerException: 	at net.spy.memcached.internal.OperationFuture.getCas(OperationFuture.java:226)	at org.springframework.data.couchbase.core.CouchbaseTemplate$4.doInBucket(CouchbaseTemplate.java:319)	at org.springframework.data.couchbase.core.CouchbaseTemplate$4.doInBucket(CouchbaseTemplate.java:301)	at org.springframework.data.couchbase.core.CouchbaseTemplate.execute(CouchbaseTemplate.java:246)	at org.springframework.data.couchbase.core.CouchbaseTemplate.save(CouchbaseTemplate.java:301)	at org.springframework.data.couchbase.core.CouchbaseTemplate.save(CouchbaseTemplate.java:150)	at org.springframework.data.couchbase.repository.support.SimpleCouchbaseRepository.save(SimpleCouchbaseRepository.java:82)	at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:475)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:460)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:432)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.data.couchbase.repository.support.ViewPostProcessor$ViewInterceptor.invoke(ViewPostProcessor.java:87)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)	at com.sun.proxy.$Proxy122.save(Unknown Source)	at com.paypal.fi.data.couchbase.repository.CouchbaseRepository.saveUserDocumentAsync(CouchbaseRepository.java:192)	at com.paypal.fi.data.couchbase.repository.CouchbaseRepository$$FastClassBySpringCGLIB$$ca9d4fbb.invoke()	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)	at com.paypal.fi.core.annotation.CalTransactionAwareInterceptor.invoke(CalTransactionAwareInterceptor.java:69)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at com.paypal.fi.core.annotation.NamedAsyncInterceptor$1.call(NamedAsyncInterceptor.java:51)	at com.paypal.fi.core.async.AsyncTask.call(AsyncTask.java:61)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:744)