Mollie gateway

I had Mollie iDeal working but now I have this error:
Mollie: [curl] 60: SSL certificate problem: unable to get local issuer certificate [url]

Im using this on the self-hosting version 4.5.17

What can caused this error that the test payments not working anymore? Can it be that Mollie uses a v2 api? Can you please update or give me the fix that it can be used on the v2 api? I start in a short time in the real site with InvoiceNinja but now have this error so plz help me soon.

Many thnx!

Please see this issue: