Blazor error rendering


i try to generate a Edit page (using this tutorial ) but when i try to open the edit dialog (edit page have a form with autogenerate components) i have this error

i try to remove the component and manualy add component and i see that when i add the first coponent the problem appear (if the page have only label,button and the form component problem is not present)....

this is the configuration in the edit page for the first component

any idea? is something wrong in the configuration?


Most probably product is null for some reason.

this is strange because i try to debug with vs2019 and the product is not null...