Troubleshooting sending a mail in Mautic 2.0

Hello when I tried to send an email in Mautic 2.0 I’ve received the following message.



Can you help me please?



Mensagem%20de%20erro%20Mautic.jpg


Hello when I tried to send an email in Mautic 2.0 I’ve received the following message.

Can you help me please?