Fatal error: Uncaught Exception: MySQL Error: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'vrboot.u.pk_user_main' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by in /u01/vr/vrboot-main/source/include/cls_db.php:372 Stack trace: #0 /u01/vr/vrboot-main/source/include/cls_db.php(350): MyPDO->outputError('Expression #1 o...') #1 /u01/vr/vrboot-main/source/include/cls_db.php(59): MyPDO->getPDOError() #2 /u01/vr/vrboot-main/template/black2021/module/index.php(53): MyPDO->query('SELECT u.*,p.av...') #3 /u01/vr/vrboot-main/template/black2021/module/index.php(16): get_recommend_people() #4 /u01/vr/vrboot-main/index.php(15): require('/u01/vr/vrboot-...') #5 {main} thrown in /u01/vr/vrboot-main/source/include/cls_db.php on line 372