"Oh no, we can't find your pledge"

Ok, so I have set up the Fundraising plugin on a site; however, I am getting the “Oh No, we can’t find your Pledge. Sometimes it take a few moments for your Pledge to be logged. You can try refreshing this page” error after I submit. I have looked through other posts on this site and have found little help.

This error is occurring in both live and sandbox mode. There is no issues with apostrophes in the name (as one user had) and is happening in both Chrome and Safari (as one user was having a chrome issue). Any help that can be offered?