Solution 4: enable the Snipping Tool notification
This error can be caused by the notification disabled from the Snipping Tool.
1. Open Settings.
2. Then click on «System”Settings on the left side.
3. Then scroll down the right panel and click on the «Notifications“.
4. Again, scroll down through the same window and look for the «Cropping tool“.
5. Make sure it is turned «Upon“.
After that, close the Settings window.
Now, try taking a screenshot with the shortcut key.