Ykmsheppared.club is an unsafe website that uses a misleading error message to get users' permission to send them advertising content. When visiting Ykmsheppared.club, users will see a pop-up window that claims they need to click on an "Allow" button to prove they are not robots. In fact, clicking that button only confirms a user's subscription to Ykmsheppared.club's notifications! Then, the website starts delivering sponsored third-party content to the subscribers' computers or mobile phones directly. The annoying advertisements are all about suspicious Internet pages and services, and they show up even if no browser is launched.
The appearance of Ykmsheppared.club's notifications on your display could be a symptom of more serious computer infection. Therefore, it should not be ignored. Adware threats and browser hijackers can also generate such pop-up messages and redirect users to potentially harmful websites. Potentially Unwanted Programs (PUPs) of that type often have data-tracking features and, respectively, collect sensitive user data that can be misused by third-parties. We recommend scanning your device for malware with a certified anti-virus program that will detect any remove any threats.