MySQL Error - incompatible with sql_mode=only_full_group_by

Assalamualaikum Warahmatullahi Wabarakatuh...
 
mohon pencerahannya !
 
A Database Error Occurred
Error Number: 1140
 
In aggregated query without GROUP BY, expression #2 of SELECT list contains nonaggregated column 'lapakku_toko_onlinemu.a.kurir'; this is incompatible with sql_mode=only_full_group_by
 
SELECT a.kode_transaksi, a.kurir, a.service, a.proses, a.ongkir, e.nama_kota, f.nama_provinsi, sum((b.harga_jual*b.jumlah)-(c.diskon*b.jumlah)) as total, sum(c.berat*b.jumlah) as total_berat FROM `rb_penjualan` a JOIN rb_penjualan_detail b ON a.id_penjualan=b.id_penjualan JOIN rb_produk c ON b.id_produk=c.id_produk JOIN rb_konsumen d ON a.id_pembeli=d.id_konsumen JOIN rb_kota e ON d.kota_id=e.kota_id JOIN rb_provinsi f ON e.provinsi_id=f.provinsi_id where a.kode_transaksi='TRX-20211127065722'
 
Filename: views/administrator/mod_penjualan/view_orders_report.php
 
Line Number: 26