My SQL Errors Debug..

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MySQL Error : Unknown column 'SUBTEASET' in 'where clause'
Query Result : select a.* 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 b.D_Level = 2 and b.D_Pid = 10 and find_in_set(SUBTEASET, a.N_Class)