Error on activating Caldera Forms Plugin

I’m getting this error when I activate Caldera Forms plugin:

Warning: require(C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\symfony\polyfill-mbstring/bootstrap80.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\symfony\polyfill-mbstring\bootstrap.php on line 15
  
Fatal error: Uncaught Error: Failed opening required 'C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\symfony\polyfill-mbstring/bootstrap80.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\symfony\polyfill-mbstring\bootstrap.php:15 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\composer\autoload_real.php(69): require() #1 C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\composer\autoload_real.php(59): composerRequireb6656ff7e1a4bf56611bfebfbafb5265('0e6d7bf4a5811bf...', 'C:\\xampp\\htdocs...') #2 C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\autoload.php(7): ComposerAutoloaderInitb6656ff7e1a4bf56611bfebfbafb5265::getLoader() #3 C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\caldera-core.php(113): include_once('C:\\xampp\\htdocs...') #4 C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\classes\core.php(490): caldera_forms_load() #5 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(303): Caldera_Forms::activate_caldera_forms('') #6 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(327): WP_Hook->apply_filters('', Array) #7 C:\xampp\htdocs\wordpress\wp-includes\plugin.php(470): WP_Hook->do_action(Array) #8 C:\xampp\htdocs\wordpress\wp-admin\plugins.php(193): do_action('activate_calder...') #9 {main} thrown in C:\xampp\htdocs\wordpress\wp-content\plugins\caldera-forms\vendor\symfony\polyfill-mbstring\bootstrap.php on line 15

• This topic was modified 3 years, 2 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic