File Adapter -Java Exception

The message status through a file adapter shows delivered however the log reads Error with different kind of exception each time . What can be the possible issue? How to supress this error?

java.lang.Exception: Exception in XML Parser
(format problem?):'java.l ang.Exception: Message processing failed in XML
parser: 'java.io.IOExc eption: A file, file system or message queue is no
longer available.', probably configuration error in file adapter (XML parser
error)'

java.io.IOException: A file, file system or
message queue is no longer available.

java.io.IOException: There is an input or output
error.