I have added my first Ui-field

I did not add the field to the page only created it.
I then selected preview and the page freezes forever.

If I then delete the Ui-field the page displayes in preview. Why
I have added my first Ui-field

I did not add the field to the page only created it.
I then selected preview and the page freezes forever.

If I then delete the Ui-field the page displayes in preview. Why
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