'Cannot place and use a UserControl in a form

Im developing a winform software using user controls. I have my database and models created with EntityFrameworkCore 3.1.23 (used database first approach). I builded it but i cannot place any of the user controls. enter image description here

THIS IS WHAT I GET. I DONT UNDERSTAND WHATS WRONG PLEASE HELP I NEED THIS APP TILL FRIDAY!

thanks in advance

user-controls


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