Error after submission - newsletter subscribe

Hi
I installed the newsletter subscribe contribution , looks good and works fine , sends the emails and updates the data, but after I click on subscribe , I get the thank you page with the below error at the top of the Thank you page.

The subscriber email gets the email and the address is added to the list of subscribers,I am using PHP mailer, zen 138a and the mail is functioning normal.

No error is showing in the cache.

WordWrap] => 76 [Mailer] => mail [Sendmail] => /usr/sbin/sendmail [PluginDir] => [Version] => 1.73 [ConfirmReadingTo] => [Hostname] => [Host] => localhost [Port] => 25 [Protocol] => [Helo] => [SMTPAuth] => [Username] => [Password] => [Timeout] => 10 [SMTPDebug] => [SMTPKeepAlive] => [smtp] => [to] => Array ( [0] => Array ( [0] => [email protected] [1] => ) ) [cc] => Array ( ) [bcc] => Array ( ) [ReplyTo] => Array ( [0] => Array ( [0] => [email protected] [1] =>companyname ) ) [attachment] => Array ( ) [CustomHeader] => Array ( ) [message_type] => [boundary] => Array ( ) [language] => Array ( [provide_address] => You must provide at least one recipient email address. [mailer_not_supported] => mailer is not supported. [execute] => Could not execute: [instantiate] => Could not instantiate mail function. Please check Admin->Configuration->Email Options->Email Transport. [authenticate] => SMTP Error: Could not authenticate. [from_failed] => The following From address failed: [recipients_failed] => SMTP Error: The following recipients failed: [data_not_accepted] => SMTP Error: Data not accepted. [connect_host] => SMTP Error: Could not connect to SMTP host. [file_access] => Could not access file: [file_open] => File Error: Could not open file: [encoding] => Unknown encoding: ) [error_count] => 0 [LE] => )

Thanks so much for the help