Im using the U7 grid data type package to do some repeated content. I need to sort these items and then take 1.

BUT, i get the following error when trying to sort:

'Newtonsoft.Json.Linq.JArray' does not contain a definition for 'OrderBy'

My code is as follows

@{
var afholdelser = CurrentPage.afholdelser.OrderBy("afholdelsdato"); 
foreach (var afholdelse in afholdelser) {
    <p>do stuff</p>
}}

What am i doing wrong?