Petals BC FTP

Error: java.lang.NullPointerException
	at org.ow2.petals.bc.ftp.connection.WrappedFTPClient.fileExistOnRemoteDirectory(WrappedFTPClient.java:497)
	at org.ow2.petals.bc.ftp.connection.WrappedFTPClient.putString(WrappedFTPClient.java:456)
	at org.ow2.petals.bc.ftp.service.FTPService.processPut(FTPService.java:622)
	at org.ow2.petals.bc.ftp.listener.JBIListener.onJBIMessage(JBIListener.java:129)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.invokeJBIListener(MessageExchangeProcessor.java:590)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.processAsProvider(MessageExchangeProcessor.java:557)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.process(MessageExchangeProcessor.java:282)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.run(MessageExchangeProcessor.java:182)
	at org.ow2.petals.component.framework.process.JBIProcessorThreadPoolExecutor$ExchangeRunnable.run(JBIProcessorThreadPoolExecutor.java:90)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
	at org.ow2.petals.component.framework.process.JBIProcessorThreadFactory$JBIProcessorThread.run(JBIProcessorThreadFactory.java:99)