Error on auto repond email

Support forumCategory: QuestionsError on auto repond email
Dave asked 4 years ago
Hi all I have set up an auto respond so when someone makes an appointment they get an email to confirm the details but its not sending ------------ ERROR #5 ------------
ERRORS: {"wp_mail_failed":["Could not instantiate mail function."]}
ERRORS_DATA: {"wp_mail_failed":{"to":[""],"subject":"Reservation 5","message":"<!DOCTYPE HTML>\n<html lang=\"en\">\n <head>\n <meta http-equiv=\"Content-Type\" content=\"text\/html;charset=UTF-8\">\n <\/head>\n <body>\n confirmed\n <\/body>\n<\/html>","headers":[],"attachments":[],"phpmailer_exception_code":2}}
---------- ERROR #5 END ----------