Title: mcrypt error when viewing unit page Last modified: January 11, 2017 --- # mcrypt error when viewing unit page * Resolved [wpdev999](https://wordpress.org/support/users/wpdev999/) * (@wpdev999) * [9 years, 4 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/) * I’m having yet another problem with CoursePress. This time I am getting the following error: * Warning: mcrypt_encrypt(): Key of size 20 not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported in /home/content/p3pnexwpnas13_data03/53/ 3103553/html/wp-content/plugins/coursepress/2.0/include/coursepress/helper/class- utility.php on line 496 * You can see the screenshot here. This screenshot uses the default CoursePress- supplied theme. [https://www.dropbox.com/s/lymrw7nf11vk9wx/CoursePress%20Error.jpg?dl=0](https://www.dropbox.com/s/lymrw7nf11vk9wx/CoursePress%20Error.jpg?dl=0) Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Support [Amin – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support2/) * (@wpmudev-support2) * [9 years, 4 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8648724) * Hello wpdev999, * What PHP version do you have on your server? * I need to consult this with developer because I can see we had similar issue in past, but for different file and I’m not sure at the moment if provided fix would also work for you. * kind regards, Kasia * Thread Starter [wpdev999](https://wordpress.org/support/users/wpdev999/) * (@wpdev999) * [9 years, 4 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8650923) * This site is running PHP 5.6.27. * Plugin Support [Imran – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support9/) * (@wpmudev-support9) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8674596) * Hello [@wpdev999](https://wordpress.org/support/users/wpdev999/), I hope you are doing well * Please download the file : [https://ufile.io/c99261](https://ufile.io/c99261) * And replace it with the one located in this path: `coursepress/2.0/include/coursepress/ helper/class-utility.php` * This should fix the issue. Also, make sure that you will keep the original class- utility.php file, just in case if something goes wrong, you can place it back. * Let me know how it goes! * Cheers, Nastia * Thread Starter [wpdev999](https://wordpress.org/support/users/wpdev999/) * (@wpdev999) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8675151) * This seems to have fixed the mcrypt error, but now everytime I click Next on a unit it doesn’t do anything. The screen dims but nothing happens. * Thread Starter [wpdev999](https://wordpress.org/support/users/wpdev999/) * (@wpdev999) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8685251) * Since replacing this file with the one provided we now get “Fatal error: Using $this when not in object context in” referencing the class-utility.php file on line 487. * Plugin Support [Amin – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support2/) * (@wpmudev-support2) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8687421) * Hello wpdev999, * Thank you for additional information. I’m passing this to developer so they can provide a better fix for this issue. * kind regards, Kasia * Plugin Support [Amin – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support2/) * (@wpmudev-support2) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8687442) * Hello wpdev999, * I got more info – this will be fixed in next version. Can you now replace new file class-utility.php with old file and as workaround in wp-config.php find line * `define('NONCE_KEY', 'put your unique phrase here');` * and where there is “put your unique phrase here” insert key that is more than 24 characters. It is possible that you already have key inserted there – then just increase the length of it above the 24 characters. * Let me know if this works for you. * kind regards, Kasia * Thread Starter [wpdev999](https://wordpress.org/support/users/wpdev999/) * (@wpdev999) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8689010) * Going back to the old file and changing the key seems to work so far, but more testing will be required. * Plugin Author [jdailey](https://wordpress.org/support/users/jdailey/) * (@jdailey) * [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8702215) * Thank you for the update. Let us know if you run into any problem. Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘mcrypt error when viewing unit page’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/coursepress_f7e9b6.svg) * [CoursePress Learning Management System](https://wordpress.org/plugins/coursepress/) * [Frequently Asked Questions](https://wordpress.org/plugins/coursepress/#faq) * [Support Threads](https://wordpress.org/support/plugin/coursepress/) * [Active Topics](https://wordpress.org/support/plugin/coursepress/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/coursepress/unresolved/) * [Reviews](https://wordpress.org/support/plugin/coursepress/reviews/) * 9 replies * 4 participants * Last reply from: [jdailey](https://wordpress.org/support/users/jdailey/) * Last activity: [9 years, 3 months ago](https://wordpress.org/support/topic/mcrypt-error-when-viewing-unit-page/#post-8702215) * Status: resolved