java.io.IOException is not a valid file path in Mule when everything appears successful
<p>I have a simple sftp mule flow which pulls a file from a local instance of CrushFTP.  This appears to work successfully and I can see the contents of the file in the payload and can see the file is deleted but I keep getting the error message below.  How can I stop this error?</p>

<pre><code>*******************************************************************************************************
*            - - + APPLICATION + - -            *       - - + DOMAIN + - -       * - - + STATUS + - - *
*******************************************************************************************************
* sftpproj                                      * default                        * DEPLOYED           *
*******************************************************************************************************

INFO  2016-09-29 19:21:43,617 [[sftpproj].sftpprojFlow.stage1.02] com.mulesoft.weave.mule.utils.MuleWeaveFactory$: MimeType was not resolved '*/*' delegating to Java.
INFO  2016-09-29 19:21:44,272 [[sftpproj].sftpprojFlow.stage1.03] com.mulesoft.weave.mule.utils.MuleWeaveFactory$: MimeType was not resolved '*/*' delegating to Java.
ERROR 2016-09-29 19:21:44,998 [[sftpproj].SFTP.receiver.01] org.mule.transport.sftp.SftpMessageReceiver: Error in poll
java.io.IOException: /input/test.csv is not a valid file path (//input/test.csv)
    at org.mule.transport.sftp.SftpClient.getSize(SftpClient.java:474) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.transport.sftp.SftpClient.retrieveFile(SftpClient.java:353) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.transport.sftp.SftpReceiverRequesterUtil.retrieveFile(SftpReceiverRequesterUtil.java:187) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.transport.sftp.SftpMessageReceiver$1.process(SftpMessageReceiver.java:188) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.transport.sftp.SftpMessageReceiver$1.process(SftpMessageReceiver.java:179) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.execution.ExecuteCallbackInterceptor.execute(ExecuteCallbackInterceptor.java:16) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.CommitTransactionInterceptor.execute(CommitTransactionInterceptor.java:35) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.CommitTransactionInterceptor.execute(CommitTransactionInterceptor.java:22) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.HandleExceptionInterceptor.execute(HandleExceptionInterceptor.java:30) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.HandleExceptionInterceptor.execute(HandleExceptionInterceptor.java:14) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.BeginAndResolveTransactionInterceptor.execute(BeginAndResolveTransactionInterceptor.java:67) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.ResolvePreviousTransactionInterceptor.execute(ResolvePreviousTransactionInterceptor.java:44) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.SuspendXaTransactionInterceptor.execute(SuspendXaTransactionInterceptor.java:50) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.ValidateTransactionalStateInterceptor.execute(ValidateTransactionalStateInterceptor.java:40) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.IsolateCurrentTransactionInterceptor.execute(IsolateCurrentTransactionInterceptor.java:41) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.ExternalTransactionInterceptor.execute(ExternalTransactionInterceptor.java:48) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.RethrowExceptionInterceptor.execute(RethrowExceptionInterceptor.java:28) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.RethrowExceptionInterceptor.execute(RethrowExceptionInterceptor.java:13) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.TransactionalErrorHandlingExecutionTemplate.execute(TransactionalErrorHandlingExecutionTemplate.java:110) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.execution.TransactionalErrorHandlingExecutionTemplate.execute(TransactionalErrorHandlingExecutionTemplate.java:30) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.transport.sftp.SftpMessageReceiver.routeFile(SftpMessageReceiver.java:178) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.transport.sftp.SftpMessageReceiver.poll(SftpMessageReceiver.java:121) ~[mule-transport-sftp-3.7.3.jar:3.7.3]
    at org.mule.transport.AbstractPollingMessageReceiver.performPoll(AbstractPollingMessageReceiver.java:216) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.transport.PollingReceiverWorker.poll(PollingReceiverWorker.java:80) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.transport.PollingReceiverWorker.run(PollingReceiverWorker.java:49) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.transport.TrackingWorkManager$TrackeableWork.run(TrackingWorkManager.java:267) ~[mule-core-3.7.3.jar:3.7.3]
    at org.mule.work.WorkerContext.run(WorkerContext.java:286) ~[mule-core-3.7.3.jar:3.7.3]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_66]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_66]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]
</code></pre>

<p>XML</p>

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;

&lt;mule xmlns:ftp="http://www.mulesoft.org/schema/mule/ftp" xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw" xmlns:sftp="http://www.mulesoft.org/schema/mule/sftp" xmlns:batch="http://www.mulesoft.org/schema/mule/batch" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/sftp http://www.mulesoft.org/schema/mule/sftp/current/mule-sftp.xsd
http://www.mulesoft.org/schema/mule/batch http://www.mulesoft.org/schema/mule/batch/current/mule-batch.xsd
http://www.mulesoft.org/schema/mule/ee/ftp http://www.mulesoft.org/schema/mule/ee/ftp/current/mule-ftp-ee.xsd
http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ftp http://www.mulesoft.org/schema/mule/ftp/current/mule-ftp.xsd"&gt;
    &lt;http:request-config name="HTTP_Request_Configuration" host="${host}" port="${orderprocess.port}" doc:name="HTTP Request Configuration"&gt;&lt;/http:request-config&gt;
    &lt;sftp:connector name="SFTP" validateConnections="true" doc:name="SFTP"/&gt;
    &lt;flow name="orderexperienceFlow" &gt;
        &lt;sftp:inbound-endpoint connector-ref="SFTP" host="localhost" port="2222" path="//input" user="${ftp.user}" password="${ftp.password}" responseTimeout="10000" doc:name="SFTP"/&gt;
        &lt;dw:transform-message doc:name="Transform Message"&gt;
            &lt;dw:set-payload&gt;&lt;![CDATA[%dw 1.0
%output application/java
---
payload]]&gt;&lt;/dw:set-payload&gt;
        &lt;/dw:transform-message&gt;
        &lt;object-to-string-transformer doc:name="Object to String"/&gt;  
        &lt;logger level="INFO" doc:name="Logger"&gt;&lt;/logger&gt;  
    &lt;/flow&gt;
&lt;/mule&gt;
</code></pre>

<p>CSV</p>

<pre><code>1,test
</code></pre>