Could not connect to the server error

Hi, today I am facing this error on my website, and the trade safe plugin not working on my website

Notice that I am receiving on my dashboard:

`Your account is incomplete!
Our payment service provider is TradeSafe Escrow. TradeSafe keeps the funds safe in the middle and will release the funds to you once delivery is completed successfully. Sellers are guaranteed payment.

TradeSafe forces HTTPS for all services using TLS (SSL) including their public website and the Application. All bank account details are encrypted with AES-256. Decryption keys are stored on separate machines from the application. In English, your details are encrypted with the highest industry-specific standards (which can be found in most banks), making your information confidential, secure, and safe.

and when I goto trade safe plugin settings, the plugin showing an error:

Could not connect to the server

website: realppe.co.za

Please Help Me Thanks.