My SQL Errors Debug..

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MySQL Error : Unknown column 'sale.php' in 'where clause'
Query Result : select distinct a.N_Key, a.N_ST, a.N_sMoney, a.N_dMoney, a.N_Money, a.N_Img0, a.N_YN_New, a.N_Name, a.N_Subtitle, a.N_SEOUrl from artware_product as a, artware_product_catalog as b where (a.N_YN = 1 and b.D_YN = 1 ) and find_in_set(b.D_Key, a.N_Class) and find_in_set(sale.php, a.N_Class)