Guys here’s the page http://www.agedcareinsite.com.au/event
That error suddenly appeared. I did not touch that site before that error appeared.
Hello,
I have the same problem, website working and then stop working without any changes … how did u solved it ?
Thank’s for your help.
My credit card expires that’s why it stopped working.
It works fine again after I re-verify my PayPal account.
Hi !
Thank’s for your answer. It was not my issue, but thank’s !
Have a niceday !
There was recently a change in PayPal’s sandbox infrastructure that is causing this for some people. Please follow http://wordpress.org/support/topic/sandbox-error-a-payment-error-has-occurred for any updates.