Title: Internal Server Error Last modified: November 13, 2019 --- # Internal Server Error * Resolved [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/) * Hi Drazen, * Since upgrading to 2.1.0, I’m getting the following error when generating license: * > An error of type E_ERROR was caused in line 29 of the file /var/www/html/wp- > content/plugins/license-manager-for-woocommerce/vendor/defuse/php-encryption/ > src/Crypto.php. Error message: Uncaught TypeError: Key expected for argument > 2. String given instead. in /var/www/html/wp-content/plugins/license-manager- > for-woocommerce/vendor/defuse/php-encryption/src/Crypto.php:29 > Stack trace:# > 0 /var/www/html/wp-content/plugins/license-manager-for-woocommerce/includes/ > Crypto.php(128): Defuse\Crypto\Crypto::encrypt(‘MTXP1N42HQUTWQG…’, ”) #1 /var/ > www/html/wp-includes/class-wp-hook.php(288): LicenseManagerForWooCommerce\Crypto- > >encrypt(‘MTXP1N42HQUTWQG…’) #2 /var/www/html/wp-includes/plugin.php(206): > WP_Hook->apply_filters(‘MTXP1N42HQUTWQG…’, Array) #3 /var/www/html/wp-content/ > plugins/license-manager-for-woocommerce/includes/integrations/woocommerce/Controller. > php(194): apply_filters(‘lmfwc_encrypt’, ‘MTXP1N42HQUTWQG…’) #4 /var/www/html/ > wp-includes/class-wp-hook.php(288): LicenseManagerForWooCommerce\Integrations\ > WooCommerce\Controller->insertGeneratedLicenseKeys(NULL, 1726, Array, 3, Object( > LicenseManagerForWooCommerce\Models\Resources\Generator)) #5 /var/www/html/ > wp-includes/plugin.php(206): WP * Because I installed the beta plugin and had problem installing this latest version, I had to manually delete the plugin folder and the defuse/secret folder and recreated the API key and generators. Viewing 15 replies - 1 through 15 (of 15 total) * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12130445) * Hello [@deve42](https://wordpress.org/support/users/deve42/) * The problem seems to happen when a license key is being created via a generator, and then saved. It’s possibly related to the cryptographic secret files. Did you make a backup of those? * Also, do you have a test environment where I could take a look myself? Its hard to tell the exact cause without some good ol’ debugging 🙂 * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12134266) * Yes I backed up the two files and added them to wp-config.php. However, after the failed installation of the latest version (from the GitHub version), I manually deleted the settings in wp-config.php and removed all related folders and files( even checked the DB for orphan tables). So it was a clean install and I recreated generators but once I try to buy a product, checkout fails with “Internal Server Error”. * Could it be php 7.3 which I installed? * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12134276) * [@deve42](https://wordpress.org/support/users/deve42/), * it could be, to be honest I haven’t tested it with PHP 7.3 yet. Could you try reverting to 7.2 and see if it still works? * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12134674) * Reverted to 7.2 and it’s the same error: * > 2019-11-14T20:43:48+00:00 CRITICAL Uncaught TypeError: Key expected for argument > 2. String given instead. in /var/www/html/wp-content/plugins/license-manager- > for-woocommerce/vendor/defuse/php-encryption/src/Crypto.php:29 > Stack trace:# > 0 /var/www/html/wp-content/plugins/license-manager-for-woocommerce/includes/ > Crypto.php(128): Defuse\Crypto\Crypto::encrypt(‘N6S2UXKNB47WACP…’, ”) #1 /var/ > www/html/wp-includes/class-wp-hook.php(288): LicenseManagerForWooCommerce\Crypto- > >encrypt(‘N6S2UXKNB47WACP…’) #2 /var/www/html/wp-includes/plugin.php(206): > WP_Hook->apply_filters(‘N6S2UXKNB47WACP…’, Array) #3 /var/www/html/wp-content/ > plugins/license-manager-for-woocommerce/includes/integrations/woocommerce/Controller. > php(194): apply_filters(‘lmfwc_encrypt’, ‘N6S2UXKNB47WACP…’) #4 /var/www/html/ > wp-includes/class-wp-hook.php(288): LicenseManagerForWooCommerce\Integrations\ > WooCommerce\Controller->insertGeneratedLicenseKeys(3152, 1726, Array, 1, Object( > LicenseManagerForWooCommerce\Models\Resources\Generator)) #5 /var/www/html/ > wp-includes/plugin.php(206): WP in /var/www/html/wp-content/plugins/license- > manager-for-woocommerce/vendor/defuse/php-encryption/src/Crypto.php on line > 29 * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12134750) * [@deve42](https://wordpress.org/support/users/deve42/) * I think that, for whatever reason, your cryptographic secrets (defuse and secret) aren’t being loaded properly. Can you try removing the variables from wp-config. php and putting the files back in the lmfwc-files folder to see if that fixes it? * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12135015) * I put the files back and the error went away. However, there are two issues: * 1) I’m using character map ABCDEFGHJKLMNPQRSTUVWXYZ123456789, with 4 chunks of length 5 and a suffix in this format: -XW8QA * The license generated is: PJZTPPJ7PJAJGACMCRXG-XW8QA * It used to generate the correct format like this one: 8U7WC-JNLEL-5J56S-EL26L- DM8PT * 2) The license keys page in My-Account (/my-account/view-license-keys/) is not found (404) * Any idea what’s going on? * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12135649) * The second part should be easy: Save your permalinks and it should work again. * As for the generator, I am unsure. Have you tried deleting it and creating a new one? * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12135664) * Yes I’ve deleted the generators a few times and recreated them. Changed the character map as well but it’s still generating licenses without the dashes. - This reply was modified 6 years, 6 months ago by [deve42](https://wordpress.org/support/users/deve42/). * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12135888) * [@deve42](https://wordpress.org/support/users/deve42/), * I don’t think we’ll make much more progress like this. Do you have a test/staging environment where I could log in and take a look myself? * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12139243) * Ok I got it fixed by adding a dash into the Separator field. Didn’t have to do this before as it is optional and the dash is default. I’ll test it more and see if everything is working. * Thanks for your help again, Drazen! * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12139287) * [@deve42](https://wordpress.org/support/users/deve42/), * no problem, glad that I could at least solve part of your problem 🙂 * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12139831) * So I set up a brand new test server with PHP 7.2 and it’s generating the same license without the dashes if I don’t add it manually in the Separator field. * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12139870) * Hello [@deve42](https://wordpress.org/support/users/deve42/) * Yes, that is correct and it should have always been so. * In the 2.1 update I have updated the PHP class in charge of generating license keys. This class was a corner stone of the plugin, and coded very early on. A lot of functionality is based on it, so I have been reluctant to rework and refactor that class. The rework was necessary because it the coding wasn’t up to standard. * I have finally done this in the 2.1 update, and one major change was the removal of default generator values. If a generator didn’t have a separator, it would use a dash. This was unintentional and undesired behavior. Separators should only be used if they are explicitly defined, otherwise the chunks will just be connected without a separator. * Thread Starter [deve42](https://wordpress.org/support/users/deve42/) * (@deve42) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12143459) * I see, thanks for clarifying. It would help if this breaking change is mentioned in the release notes. * [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * (@drazenbebic) * [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12145271) * [@deve42](https://wordpress.org/support/users/deve42/), * Actually, I don’t know why I didn’t think of that myself. I will update the release notes accordingly, thank you. Viewing 15 replies - 1 through 15 (of 15 total) The topic ‘Internal Server Error’ is closed to new replies. * ![](https://ps.w.org/license-manager-for-woocommerce/assets/icon-256x256.gif? rev=2824216) * [License Manager for WooCommerce](https://wordpress.org/plugins/license-manager-for-woocommerce/) * [Frequently Asked Questions](https://wordpress.org/plugins/license-manager-for-woocommerce/#faq) * [Support Threads](https://wordpress.org/support/plugin/license-manager-for-woocommerce/) * [Active Topics](https://wordpress.org/support/plugin/license-manager-for-woocommerce/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/license-manager-for-woocommerce/unresolved/) * [Reviews](https://wordpress.org/support/plugin/license-manager-for-woocommerce/reviews/) ## Tags * [api](https://wordpress.org/support/topic-tag/api/) * [rest](https://wordpress.org/support/topic-tag/rest/) * [serial](https://wordpress.org/support/topic-tag/serial/) * [serial key](https://wordpress.org/support/topic-tag/serial-key/) * 15 replies * 2 participants * Last reply from: [Drazen Bebic](https://wordpress.org/support/users/drazenbebic/) * Last activity: [6 years, 6 months ago](https://wordpress.org/support/topic/internal-server-error-594/#post-12145271) * Status: resolved