MySQL error in file: /engine/initVars.php at line 153

Error Number: 1055

The Error returned was:
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'admin_myzaym.dle_compare.items' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SQL query:

SELECT (LENGTH(items) - LENGTH(REPLACE(items,',','')) + 1) AS count, module, items FROM dle_compare WHERE user_ip = '18.205.56.209' AND country = 'kz' GROUP BY module