Problem with 2000 Acura 1.6 EL automatic door opener HELP!!!

Here is my problem: When I unlock my doors, using the remote, they unlock. However when I use the remote to try and lock the doors - they
dont lock and my panic alarm beeps three time, just like when you try to lock the car when a door is open.
I have tried disconnecting my battery thinking that the problem would rest after reconnecting the battery. NO luck!!!
Can anyone help????
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