Warning: Undefined array key "appearance-disable-flip-sound" in E:\xampp\htdocs\wordpress\wp-content\plugins\pdf-viewer-for-wordpress\web\viewer-shortcode.php on line 77

Fatal error: Uncaught TypeError: Cannot access offset of type string on string in E:\xampp\htdocs\wordpress\wp-content\plugins\pdf-viewer-for-wordpress\web\viewer-shortcode.php:79 Stack trace: #0 E:\xampp\htdocs\wordpress\wp-content\plugins\pdf-viewer-for-wordpress\tnc-pdf-viewer-shortcode.php(11): require() #1 E:\xampp\htdocs\wordpress\wp-includes\template-loader.php(106): include('E:\\xampp\\htdocs...') #2 E:\xampp\htdocs\wordpress\wp-blog-header.php(19): require_once('E:\\xampp\\htdocs...') #3 E:\xampp\htdocs\wordpress\index.php(17): require('E:\\xampp\\htdocs...') #4 {main} thrown in E:\xampp\htdocs\wordpress\wp-content\plugins\pdf-viewer-for-wordpress\web\viewer-shortcode.php on line 79
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