errors on the create detail screen mobile track


According to the tutorial I have to drag the category Id to make a dropdown. But then  I see these two errors 

I will also include my .oml file so far. 

Someone who knows what I did wrong ? 


Hi Roelof,

On "Options Content"  choose custom. That inside the dropdown add an expression with this "GetCategories.List.Current.Category.Name" 




Hi Roelof,

Set the Options Content to Custom, drag an expression to the DropDown and choose the Category Name field from the aggregate.

oke, or I missed that part or it is not mentioned in the tutorial somewhere.