Unable to add customer. Gateway communication error

Hello, 

I have a customer that wants to pay for an invoice with a credit card. Is the first time this customer pay their invoices with a credit card. 

When I tried to add the credit card I get an error "Unable to add customer. Gateway communication error" I have not seen this error before. 

I'm getting this error only with this customer they are located in Canada. I don't know what I'm doing wrong. Thanks.