Hello - I'm having the same issue with some of my clients trying to pay me via ACH bank transfer.    This is what my client sent me as they were trying to process the payment, but was unsuccessful:

I keep trying to process ACH via the link you sent, however there seems to be something wrong with the website. Here is error message I receive. (see attached)

I have tried in 2 different browsers (chrome & explorer) and also in incognito mode and get the same error each time.