Strange error in binding ILIST to DataGridView

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ASP.NET4

Hi all,

I have a webapi which sends me a JSON result. This result is mapped to a list of objects (Employee).
In my ASP.NET GridView I do:

werknemer = new DataCollector.WerknemerRepository();

                grdPersoneel.DataSource = werknemer.Get();
                grdPersoneel.DataBind();

(translation: werknemer = employee. Personeel = employees)

But on grdPersoneel.DataBind(); I get the message:

The data source for the GridView with id grdPersoneel had no features or details that columns could be generated. Make sure the data source has content.

The grdPersoneel.DataSource claims is has the 241 available rows, just likt the List<> in the result of werknemer.Get(). Why it does not databind and how to get the data bind?