[Mailman-Developers] 3.1.4 upgrade problem

After upgrading to 3.1.4 from 3.1.3 I now have a problem when any post is attempted. Perhaps someone can help me with this.

Traceback (most recent call last): File "/usr/local/mailman/scripts/post", line 69, in ? main() File "/usr/local/mailman/scripts/post", line 64, in main tolist=1, _plaintext=1) File "/usr/local/mailman/Mailman/Queue/Switchboard.py", line 133, in enqueue os.fsync(msgfp.fileno()) AttributeError: 'module' object has no attribute 'fsync' 554 5.3.0 unknown mailer error 1

Thanks, Joel