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That is a SCAM message. Don't worry. You will not lose anything.
Press Command, Option and Esc keys and this will bring Force Quit window. Select Safari and click Force Quit. This will close Safari.
Then hold down Shift key on your keyboard and open Safari. Click on Safari menu and select Clear History and Websiate Data. On the dropdown next to Clear, select All History and click Clear History.
Then click on Safari menu and select Preferences. Then click on Privacy tab. Click Remove All Website Data. Click Remove Now. Restart Safari.
That will clear it. If you have any questions or would like any additional information, please don't hesitate to ask
Hi there, It's me Ashik again. I'm just checking. How is it going ?