Aliexpress blocked you for security purposes. But nothing to worry. You should submit your ID proof and scanned credit card. They will verify it in 4 or 5 days.
But do not place orders with other aliexpress from another account or card till this issue solved. That too will be blocked.
Please check this video for more info. https://www.youtube.com/watch?v=fIULVk4YDYE