deeplinking tools show empty gray screen and can't find flutter project

[mhamri]

<-- Please describe your problem here. Be sure to include repro steps. -->

first of all if I click on validate deep link where it shows me the current project

it shows me that it's not a flutter project

then if I type the URL in the 2nd input by myself and click validate deep links I get me an empty gray screen

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DevTools version: 2.42.3 IDE: VSCode