SFTP Smart Services

I am using v2.0 I am not able to receive file by using "Receive File Over SFTP (Basic Credentials). 

It is giving error, "String index out of range : -1".

"Send File Over SFTP (Basic Credentials) " is working fine and I am able to send file to the remote site.

Any help on this will be appreciated.

Thanks 

Can you include the stack trace from the tomcat-stdout.log to get more information on what is throwing this exception?

Can you include the stack trace from the tomcat-stdout.log to get more information on what is throwing this exception?

It seems like there is an invalid filename. What are the sftpServerFilePath and documentName parameters you are passing in?

Are you perhaps trying to pull a file that doesn't have an extension?

I'm also running into same issue 

2020-10-12 17:52:03,309 [Appian Work Item - 10843 - execution01 : UnattendedJavaActivityRequest] ERROR com.appiancorp.process.engine.UnattendedJavaActivityRequest - An error occurred while executing activity: id=268465328, classname=com.appian.ps.plugins.sftpsmartservices.ReceiveFileOverSFTPBasic
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1927)
at com.appian.ps.plugins.sftpsmartservices.ReceiveFileOverSFTPBasic.run(ReceiveFileOverSFTPBasic.java:103)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.lambda$call$0(DefaultActivityExecutor.java:131)
at com.appiancorp.plugins.PluginUsageLogger.runWithPluginInformation(PluginUsageLogger.java:52)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:131)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:25)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:83)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
at com.appiancorp.process.engine.ContinuationRequest.executeOuter(ContinuationRequest.java:71)
at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:100)
at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:36)
at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:93)
at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Code at 103: ReceiveFileOverSFTPBasic

if (documentName.lastIndexOf('.') == -1)
documentName += remote_filename.substring(remote_filename
.lastIndexOf('.'));