NullPointerException: while trying to invoke the method java.lang.String.length() of a null object loaded from local variable 'str'

Dear Team,

This is basically FTP to FTPS scenario where at Receiver communication channel I'm facing below error:

Error when getting an FTP connection from connection pool: Unable to create a new pooled resource : NullPointerException while trying to invoke the method java.lang.String.length() of a null object loaded from local variable 'str'

PI fetches the text file from ECC application server and places into the target application folder wherein we face the error at receiver communication channel.

Please help. Many Thanks...!!

Regards,

Rajesh PS