Post My Case Status does not recognize the receipt number entered H1B?

[Rajshrestha]

I was picked in lottery and got receipt number, but when I am trying to see the status online, I am getting this error "My Case Status does not recognize the receipt number entered. Please check your receipt number and try again. If you need further assistance, please call the USCIS Contact Center at 1-800-375-5283.". Has any one receive this type of error? Also, in my SEVIS it shows my H1B in pending status.