PHP error when installing and saving API details
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After entering api USER name and password and clicking save button, this error is displayed.
Server was unable to process request. —> Login did not succeed for user: [email protected]. ERROR_INVALID_LOGINServer was unable to process request. —> Login did not succeed for user: [email protected]. ERROR_INVALID_LOGIN
Warning: Cannot modify header information – headers already sent by (output started at public_html/wp-content/plugins/dotmailer-sign-up-widget/DotMailerConnect.php:78) in public_html/wp-includes/pluggable.php on line 1228
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