What is error code 268D3?

Just got a pop up from Apple Support Center that says : Critical Warning Alert !! Apple Device Infected Error Code: 268D3 System ID: ix12002 Status: Call for immediate support 888-440-0505 Malicious Pornographic Spyware/Riskware Detected Do not ignore this critical alert. If you close this page, your computer access will be disabled to prevent further damage to our network. Call 888-440-0505 Where to get a repair. The white pages reverse phone number look up says that number is toll free with a low spam/fraud risk.