A Mysql error has occurred while running the script:

• The query you are trying to run is invalid
• Mysql Error Output: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND reg_date>1256197178 GROUP BY receiver_id' at line 2
• SQL Query: SELECT avg(is_read-reg_date) AS ave FROM `probid_messaging` WHERE is_read>1 AND receiver_id= AND reg_date>1256197178 GROUP BY receiver_id