Inside my form, I have a picklist. But when I validate I get this type of error: "No visible Columns defined". Does anyone know what to do?
After selecting the picklist, on the right side of the screen you can see its properties. There is a button called Column Options... you can select your visible columns from there.
https://www.screencast.com/t/QBar3gZk
Careful, if you have changed properties of the dataset model you might need to refresh your form before you can see the changes .