Error by clicking the "send request"

Hello,
I have problem to send the budget request.
Appears the following sentence: “There was a problem in sending your request Please try again..”

I have sought in various forums, but find no solution.

Please help me.

https://ww.wp.xz.cn/plugins/yith-woocommerce-request-a-quote/

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Ola,
Estou com problema para enviar o pedido de orçamento.
Aparece a seguinte frase: “There was a problem in sending your request. Please try again.”

Já busquei em vários fóruns, mas não encontro nenhuma solução.

Por favor, me ajude.