Title: Error on loading theme Last modified: May 25, 2017 --- # Error on loading theme * [chattago2002](https://wordpress.org/support/users/chattago2002/) * (@chattago2002) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/) * Hi everybody. * In last days I’ve a terrible problem with Gantry 5 (v 5.4.12) on WordPress (v 4.7.5) and Helium theme for Gantry. Initially all worked correctly but in last few days, without known reasons, I receive an error (on a blank page): `Theme cannot be used. For more information, please see the notice in administration.` and in the admin section the error is described as following: `Failed to load theme: Please run composer in Gantry 5 Library!`. I’ve used Gantry 5 and Helium in other projects with no problems. Why I have this problem? On Google/StackOverflow/ RocketTheme Forums there aren’t useful topics for this. * P.S. What is the “composer” in Gantry 5 Library? Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Author [Gantry](https://wordpress.org/support/users/gantry/) * (@gantry) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9172321) * Composer is a tool for dependency management in PHP. You shouldn’t need to do anything with it manually. Where did you download your Gantry 5 from? Gantry website, WordPress plugin directory, GitHub? * Thanks, Jakub * Thread Starter [chattago2002](https://wordpress.org/support/users/chattago2002/) * (@chattago2002) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9172510) * I found the real problem but not understanding the reason. I have a VPS and installed two different website on it, each one has a WordPress installation with Gantry 5 and Helium theme. It seems that only one Helium (or Gantry?) can be executed at a time; if I change the theme to another one (like one of the defaults), also in only one website, both are visible, also if Gantry plugin is still installed and active. So I can think there’s something I have to change or setup on my VPS to allow the multiple execution of the same theme on different virtualhost of the same VPS. Ideas? * Thanks for the reply. - This reply was modified 8 years, 11 months ago by [chattago2002](https://wordpress.org/support/users/chattago2002/). * Plugin Author [Gantry](https://wordpress.org/support/users/gantry/) * (@gantry) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9175933) * If these are two separate installations it shouldn’t matter. Did you install Gantry 5 from the WP.org or from the GitHub or from the gantry.org site? * Thread Starter [chattago2002](https://wordpress.org/support/users/chattago2002/) * (@chattago2002) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9176304) * Yes, these are 2 different installations, only the VPS is the same. I downloaded Gantry 5 directly from WP plugin directory (inside the /wp-admin of my websites) and themes from gantry.org… * I don’t know how to solve this problem… * Plugin Author [Gantry](https://wordpress.org/support/users/gantry/) * (@gantry) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9176714) * Can you try deleting and re-uploading Gantry 5 and theme on the faulty instance? * Thread Starter [chattago2002](https://wordpress.org/support/users/chattago2002/) * (@chattago2002) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9183616) * There’s not a faulty instance. Indeed if both themes ara active I can see only one of them (the last activated). So, to work with Site-1 I have to deactive Site2 and vice versa if I’ve to work with Site2. I can try to re-install Gantry 5 and theme… Is it better to download packages from gantry.org or using “wp-admin add plugin function”? I try with the first one because for these instances I used the second one and I have this problem… * Plugin Author [Gantry](https://wordpress.org/support/users/gantry/) * (@gantry) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9183783) * Well the thing that concerns me is that you wrote that it all worked fine initially but suddenly stopped. If it was working fine before, somethings must’ve happened and the question is what. Did you update anything on your VPS? Did you enabled any PHP modules? Installed new plugins? Are you using the same Gantry 5 version that when it was working fine? * If you have two separate instances of WordPress and two different set of files– all should be working fine. - This reply was modified 8 years, 11 months ago by [Gantry](https://wordpress.org/support/users/gantry/). * Thread Starter [chattago2002](https://wordpress.org/support/users/chattago2002/) * (@chattago2002) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9184190) * I’ve made another test. Everytime I restart Apache on my VPS and both instances have Helium (or Hydrogen, is the same) active, the visible instance become the first I visit (simply opening the related URL in a browser) and the other one returns with the error message (wrote in my first post); so if now I can see Site1 (and not Site2), I can restart Apache, visit the Site2 Url with my browser and then Site2 is visible and Site1 goes down. * Instead, if I use other themes (not Gantry) or only one Gantry theme at time, everything works fine, before and after Apache restart. * So, I can think about a “strange” configuration of Apache that not works properly, but for some parts that Gantry needs, because Gantry-free WP instances works fine with the same Apache configuration. * Can you help me? Is there an Apache base configuration for Gantry? * P.S. To answer your questions: no updates were made, no new PHP modules enabled or installed and I’ve alwayes used the latest Gantry version. - This reply was modified 8 years, 11 months ago by [chattago2002](https://wordpress.org/support/users/chattago2002/). - This reply was modified 8 years, 11 months ago by [chattago2002](https://wordpress.org/support/users/chattago2002/). - This reply was modified 8 years, 11 months ago by [chattago2002](https://wordpress.org/support/users/chattago2002/). * Plugin Author [Gantry](https://wordpress.org/support/users/gantry/) * (@gantry) * [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9189490) * I think that you’d have the same issue with any other plugin that uses Composer, not only Gantry 5. This sounds like an Apache misconfiguration. I’m sorry but I have no idea what could cause it. * Did you check Apache/PHP logs? You can also try to troubleshoot it following these guides [https://getcomposer.org/doc/articles/troubleshooting.md#general](https://getcomposer.org/doc/articles/troubleshooting.md#general) Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘Error on loading theme’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/gantry5_86a2c3.svg) * [Gantry 5 Framework](https://wordpress.org/plugins/gantry5/) * [Frequently Asked Questions](https://wordpress.org/plugins/gantry5/#faq) * [Support Threads](https://wordpress.org/support/plugin/gantry5/) * [Active Topics](https://wordpress.org/support/plugin/gantry5/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/gantry5/unresolved/) * [Reviews](https://wordpress.org/support/plugin/gantry5/reviews/) * 9 replies * 2 participants * Last reply from: [Gantry](https://wordpress.org/support/users/gantry/) * Last activity: [8 years, 11 months ago](https://wordpress.org/support/topic/error-on-loading-theme/#post-9189490) * Status: not resolved