AEM Asset Selector in Adobe Campaign

Hello I've tried using the AEM integration with adobe campaign to use the asset selector like this:

But I get a blank page.

So I've tried to create a web application from campaign that opens the asset selector and I've put it in the form:

<input discardReadOnly="true" img="xtk:html.png" label="Asset Selector"
prebuildSubForm="false" type="subFormLink" xpath=".">
  <form img="xtk:html.png" label="Asset Selector">
    <input type="browser" urlMode="true" xpath="/ignored/@mirrorPageUrl"/>
  </form>
</input>

It appears like this:

But when i click it before displaying the page i get this error

How do I fix this? In my Microsoft Edge it works but not in the form. Anyway I would prefer to use the normal integration with AEM but it was decomissioned...

Thank you in advance