Hi Humanjo,
Thanks for contacting Syncfusion support.
You can find the step by step procedure to host the Dashboard Server as an application in the below help link,
As per your update, we supect that, you have missed to convert the virtual directories as an application. You can find the steps in the below link to convert the virtual directories as an application,
Also, you have to update the site URL in Settings page as per your current hosted address(
http://localhost/sgeds) as below,
Once done the above steps, you can render the Dashboards without any issues.
Kindly get back to us if you need any further assistance form us.
Regards,
Dhivya