Lacerte has been getting false messages about payments not being accepted, and Proseries got them last year.   Before panicking, try calling the EFW phone number and inquire as to whether the transaction is actually scheduled or not.

I think the phone number is right on the 9325, but here it is just in case

Call IRS e-file Payment Services 24/7 at 1-888-353-4537 to inquire about or cancel your payment, but please wait 7 to 10 days after your return was accepted before calling.

(in my experience, you dont need to wait the full 7-10 days, they have it before that)