Fatal error: Uncaught Error: Call to a member function add_cap() on null in /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/Postman/PostmanInstaller.php:121 Stack trace: #0 /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/Postman/PostmanInstaller.php(70): PostmanInstaller->addCapability() #1 /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/Postman/Postman.php(127): PostmanInstaller->activatePostman() #2 /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/postman-smtp.php(174): Postman->__construct('/home/liftex/pu...', '2.1.4') #3 /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/postman-smtp.php(165): post_setupPostman() #4 /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/postman-smtp.php(94): post_smtp_start(42247504) #5 /home/liftex/public_html/staging1023r0g/wp-settings.php(428): include_once('/home/liftex/pu...') #6 /home/liftex/public_html/staging1023r0g/wp-config.php(93): require_once('/home/liftex/p in /home/liftex/public_html/staging1023r0g/wp-content/plugins/post-smtp/Postman/PostmanInstaller.php on line 121