Could you please share a bit more about your scenario?
Could you please show more details about your SP list? Is the Requestors Business Unit column a Choice type column within your SP list?
Could you please share more details about the error message within your app?
Further, do you want to list the Choice type column values (in your SP list) within the Gallery control using a Drop down control?
If you want to list the Drop down values (Choice type column values within your SP list) within your Gallery control, you should add a Drop downcontrol within the Gallery control, then set the Items property of the Drop down control to following formula:
Note: The 'Requestors_x0020_Business_x0020_' represents the Drop down column within your SP list.
Community Support Team _ Kris Dai If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.