Campaign Manager plugin for Contact Form 7

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I had a customer who was using the Campaign Manager plugin for Contact Form 7 and had started seeing an ugly error when they viewed their Plugins page in their WordPress admin portal: Fatal error: Call to undefined function wpcf7_admin_url() in /home/xxx/public_html/wp-content/plugins/contact-form-7-campaignmonitor-addon/cf7-campaignmonitor.php on line 275   Contact Form 7 is […]