Uncaught Error: Call to undefined function plugin_basename()

Getting the following errors on my sites that use Contact Form 7:

[08-May-2017 22:46:04 America/Tegucigalpa] PHP Fatal error: Uncaught Error: Call to undefined function plugin_basename() in E:\trialcourts\trial-courts-cms\wp-content\plugins\contact-form-7\wp-contact-form-7.php:19
Stack trace:
#0 {main}
thrown in E:\trialcourts\trial-courts-cms\wp-content\plugins\contact-form-7\wp-contact-form-7.php on line 19