No Item to Display in Power Apps

I have created a form in Power Apps and linked it’s Data Source to a SharePoint list.

But when I run this form using Run button from top-right corner, it displays the message No item to display OR Data Source May Be Invalid.

For this, select the Form that you want to run. See it’s Item property. It should be blank or will have some invalid value. it should have value in below format:

Defaults('SharePoint list name')

Now try to run. It will run as expected.