Getting an error has occured message on 2Checkout form

Sir !!

how can i solve this error and please tell me how and i check https://www.jotform.com/answers/869851.  this link but i can't understand please guide me

Please share with us your form so we can check this for you. 

For the meantime, you can check this article about the errors on 2Checkout: https://www.2checkout.com/developers/developers-faq#parameter-errors-on-checkout-page.