shutil.copy2 error

[Horse]

I've written a python script that copies a nightly Oracle backup file
to another server.  Every couple days, the script fails with this
error message:

Error copying Q:/Oradata/GISPROD/Backups/3UISN35R_1_1 to s:/gisprod/
backups/3UISN35R_1_1
[Errno 22] Invalid argument



Here's the code for the function I'm running.  The path names are all
correct, and it works *most of the time*.  It only fails about once or
twice a week.  Anyone know where I can get more info on this "errno 22
invalid argument"?


def CopyNewFiles(SOURCE_DIR, DEST_DIR):
    global STATUS
    try:
        os.chdir(SOURCE_DIR)
        for x in os.listdir(SOURCE_DIR):
            int_time = os.stat(x)[stat.ST_CTIME]
            str_time = time.ctime(int_time)
            if datetime.date.fromtimestamp(int_time + 0.00) >
YESTERDAY:
                try:
                    DEST_FILE = os.path.join(DEST_DIR, x)
                    logfile.write("     Copying " + SOURCE_DIR + x + "
to " + DEST_FILE + "\n")
                    logfile.flush()
                    if not os.path.isfile(DEST_FILE):
                        shutil.copy2(x, DEST_FILE)
                    else:
                        logfile.write("        File exists.  Skipping.
\n")
                        logfile.flush()
                except (IOError, os.error), why:
                    logfile.write("\n\nError copying " + SOURCE_DIR +
x + " to " + DEST_FILE + "\n\n")
                    logfile.write("\n" + str(why) + "\n")
                    logfile.flush()
                    STATUS = "FAILED"
    except:
        logfile.write("\n\nUnhandled error in CopyNewFiles\n\n")
        logfile.write("SOURCE_DIR = " + SOURCE_DIR + "\n")
        logfile.write("DEST_DIR = " + DEST_DIR + "\n")
        logfile.flush()
        STATUS = "FAILED"