Message Server Error. Please contact Support. (61) - Internal Network Error Order not completed, data is not valid

Dear, I have a joomla virtuemart website and suddenly I am getting following error

Message
Server Error. Please contact Support. (61) - Internal Network Error
Order not completed, data is not valid

I have installed wordpress also with wocommerce but on wordpress i am following error

HTTP 500 Internal Server Error: Server Error. Please contact Support. (61) - Internal Network Error
An error occurred, please try again or try an alternate form of payment.

Please dear anyone can tell me why i am getting these errors