Site: WalmartError in processing. Try again later Add new comment Comments For the last three weeks I have been unable to check out online. After choosing a delivery time and proceed to checkout I get an error message that an error in processing has occured. I cancelled my Walmart+ membership and now do all of my online grocery shopping at Publix. I use three laptops and three tablets and experience the same problem on all of them. Too bad that Walmartgrocery.com obviously isn't ready for primetime yet. reply Add new comment Your name * E-mail * The content of this field is kept private and will not be shown publicly. Comment * Notify me when new comments are posted ESTnwY Enter the code above * Enter the code without spaces.