A Database Error Occurred

Error Number: 1055

Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'cpmaxpow_db.pl.product_list_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT * FROM product_list pl, filter_kva fk WHERE fk.kva_filter_id = pl.kva_filter_id_frk AND product_category_id_frk = 8 AND pl.status =1 AND fk.status =1 GROUP BY pl.kva_filter_id_frk

Filename: models/Product_model.php

Line Number: 98