Error At Top of Website Appearing When Plug-in Active

Hi. I keep getting this error when I activate the plug-in.

Warning: Constant CE4WP_EL_EVENTTYPE already defined in /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/creative-mail-by-constant-contact/src/Modules/Contacts/Handlers/CreativeMailPluginHandler.php on line 5 Warning: Cannot modify header information - headers already sent by (output started at /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/creative-mail-by-constant-contact/src/Modules/Contacts/Handlers/CreativeMailPluginHandler.php:5) in /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 692 Warning: Cannot modify header information - headers already sent by (output started at /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/creative-mail-by-constant-contact/src/Modules/Contacts/Handlers/CreativeMailPluginHandler.php:5) in /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 694 Warning: Cannot modify header information - headers already sent by (output started at /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/creative-mail-by-constant-contact/src/Modules/Contacts/Handlers/CreativeMailPluginHandler.php:5) in /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 700 Warning: Cannot modify header information - headers already sent by (output started at /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/creative-mail-by-constant-contact/src/Modules/Contacts/Handlers/CreativeMailPluginHandler.php:5) in /customers/b/9/b/countryandcastle.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 309

• This topic was modified 2 years, 9 months ago by Yui.
• This topic was modified 2 years, 9 months ago by Yui. Reason: formatting