how to hide repetitive data while retrieving data from database

Hello i have this function

public function readData(){
$TableB1 = \DB::table('users')
->join('group_user', 'users.id', '=', 'group_user.user_id')
->join('groups', 'groups.id', '=', 'group_user.group_id')
->join('meetings', 'users.id', '=', 'meetings.owned_by_id')
->select(
    'users.name as name',
    'group_user.user_id as id',
    'groups.name as groupname',
    'meetings.owned_by_id as meetings'
)
->groupBy('users.id')
->get();

i get this error : https://ibb.co/FqPd1Wz

when i remove the groupBy part it works but repetitive data like this it returns data like this :

[{"name":"Mohamed Adel","id":6,"groupname":"Team Mohamed","meetings":6},{"name":"Mohamed Adel","id":6,"groupname":"Team Mohamed","meetings":6},{"name":"Norman Osborn","id":2,"groupname":"Team Mohamed","meetings":2},{"name":"Harry Osborn","id":3,"groupname":"Team Harry","meetings":3}]

comes Thank you

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