Hard reload your page by clicking Ctrl+Shift+R/ Cmd+Shift+R on your keyboard. You will see this Proctor Violation message, but you can ignore this just once.
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You must make sure that your internet connection is stable. If not, you can restart your wifi. While you do so, the following message will be displayed.
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If the problem still persists, you can reach out to your recruiter highlighting your issue and request a re-test.