PayPal IPN 2.1 Error 1062

[Guest]

I installed the PayPal IPN 2.1 and get the following error;

 

1062 - Duplicate entry '0' for key 1

 

insert into configuration (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Enable PayPal IPN Module', 'MODULE_PAYMENT_PAYPAL_IPN_STATUS', 'False', 'Do you want to accept PayPal IPN payments?', '6', '1', 'tep_cfg_select_option(array(\'True\', \'False\'), ', now())

 

[TEP STOP]

 

Can anyone please help?