Dynamic select list not showing

I have a form in which I try to add a dynamic list, but no show.
Server connect is:

list_1_sc462×617 59.3 KB

Local it will show the field, but no content:

list_2_frmlocal794×125 17.6 KB

Remote it doesn’t even show the field:

list_3_frrmremote796×114 9.5 KB

This is the code generated by Wappler.
<select id="advertentie" class="custom-select" dmx-bind:options="sckersttarief.data.query1" optiontext="titel" optionvalue="prijs" name="advertentie"> </select>

Can anybody tell me where I went wrong or, even better, how to solve this?