1. On your computer, click the Apple logo on the top left corner of your screen.
2. Select System Preferences.
3. Click Security & Privacy.
4. Click the Privacy tab.
5. Scroll down and select Screen Recording on the left.
6. Verify that the check box next to the Screencast-O-Matic application is selected, and has the permission for Screen Recording.
7. Close the System Preference window, restart your computer, and try again to record your screen.