Hi Hervé,
Thanks for the quick reply. I didn't even check before but I was using ver. 2.2.3 so I've that updated to 2.2.5 now and the error is gone.
What prompted me to check was because a customer ordered an item a few days ago from the site, payment went through but there was no notification that the order had been accepted. Looking at the screenshot I sent you, it says that the order is 'pending'. I hadn't noticed that earlier. I was getting an email from Stripe to say that the money had been accepted but there was no email from my site to say the order was accepted.
After updating the plugin, I did a couple of €1 transactions and it's working perfect now. The error message is gone and the orders are showing up as 'confirmed' and not 'pending'. I'm also getting emails to say the order is confirmed.
So thanks again for the help. I'm all sorted :-)
Regards,
Richie.