Import sketch project in assets step does not work (https://testrail.qt.io/index.php?/tests/view/9967440)

Tested version: QDS 4.5.1

Tested license: QDS Enterprise (rta.test48@theqtcompany.com)

Issue on Windows and Linux hosts.

Steps to reproduce:

• Open a project
• Extract the sketch project files of testScreen-800x480.zip to assets folder in project directory
• Open asset importer
• Import sketch project in assets (plus button next to assets button on left panel). In order to import need to open testScreen.metadata file in assets folder.
• Tried to import the metadata file in assets folder, unable to importing. Got a below error popup.