I removed avast and downloaded a different free antivirus and didn't get the error message. Also didn't show up on the samsung device protection so I'm ignoring it now. I think it was something to do with the update. Had no issues b4 that.
Can I ask therefore what you would recommend me to use instead as I'm not tech savvy on this sort of stuff and with my Samsung device being hacked in the past seeing this pop up has me really worried again.