I have installed Viral Inviter php script fir facebook like contact importing and sending invitation. It's collecting contact, showing success message but not sending any invitation and sending an error message to cronjob output email as below. What's wrong? How can I fix it? PHP Warning: Function registration failed - duplicate name - mssql_connect in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_pconnect in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_close in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_select_db in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_query in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_free_result in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_get_last_message in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_num_rows in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_num_fields in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_fetch_field in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_fetch_row in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_fetch_array in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_fetch_object in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_data_seek in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_field_seek in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_result in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_min_error_severity in Unknown on line 0 PHP Warning: Function registration failed - duplicate name - mssql_min_message_severity in Unknown on line 0 PHP Warning: mssql: Unable to register functions, unable to load in Unknown on line 0 Status: 404 Content-type: text/html No input file specified.