Popup window shows up then close immediately

Hi,

I'm opening a popup layout from a microflow in which a create the data view object to be passed to the page. But, the popup still open, but it's more like a flash. It disappear immediately without any error message. On the other hand, I have a FileManager form who opens the same way, from a microflow, that works great.

I'm confused.

Any help is welcome.

Thank you

Daniel