Title: Fatal error after Installing WordPress 3.0 Last modified: August 19, 2016 --- # Fatal error after Installing WordPress 3.0 * [rluquis](https://wordpress.org/support/users/rluquis/) * (@rluquis) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/) * Ok. I receive a message that says that the installation was successful. * But when I clicked to move to another page in the admin panel I get this error message: **Fatal error: Call to a member function add_rewrite_tag() on a non- object in /mnt/w0905/d42/s21/b02b2afc/www/felizsinrazon.com/blog/wp-includes/ taxonomy.php on line 289 * And now I get it everywhere. Try to go to [http://www.felizsinrazon.com](http://www.felizsinrazon.com) and see for yourself. * I can’t do anything in the site. * **Is there any solution for this??? Thanks a lot. Viewing 12 replies - 1 through 12 (of 12 total) * Thread Starter [rluquis](https://wordpress.org/support/users/rluquis/) * (@rluquis) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551804) * **ooops The WordPress installation was at [http://www.felizsinrazon.com/blog](http://www.felizsinrazon.com/blog)** * Try it and see for yourself. * [Chris Hammett](https://wordpress.org/support/users/clhammett/) * (@clhammett) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551818) * It looks like you resolved this error. Can you please tell me how? Fatal error: Call to a member function add_rewrite_tag() on a non-object in /home/content/ c/l/h/clhammett/html/AWC/wp-includes/taxonomy.php on line 289 * Thread Starter [rluquis](https://wordpress.org/support/users/rluquis/) * (@rluquis) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551824) * Hi clhammett, * First, I changed the plugins folder name to plugins2. * With that change I could enter the Admin Panel. I checked that some plugin that are very important to my site, were not working with WordPress 3.0 yet. * So I had to downgrade from WordPress 3.0 to WordPress 2.9.2. * To downgrade I follow the method posted by **bitkahuna **in this thread: [http://wordpress.org/support/topic/412235?replies=15](http://wordpress.org/support/topic/412235?replies=15) * **His method is:** * > downgrading was cake. i overlaid the 3.0 dirs wp-admin, wp-include and all > root files with 2.9.2 versions and when going to login it said it needed to > make database ‘upgrades’ which i let it, and then everything worked fine. * But be very careful when handling the wp-config.php. * If you have any other question, please ask. * **Good Luck.** * [Chris Hammett](https://wordpress.org/support/users/clhammett/) * (@clhammett) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551843) * I didn’t have such good luck. Too little experience I guess. Go Daddy helped me restore and now I’m back up. Don’t know what the issue is so I don’t want to upgrade, now. Very scary! I appreciate your response. * [Chris Hammett](https://wordpress.org/support/users/clhammett/) * (@clhammett) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551848) * If all plugins are deactivated, do you think it would be safe to try the upgrade or is it better not to. * Thread Starter [rluquis](https://wordpress.org/support/users/rluquis/) * (@rluquis) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551853) * It is better not to upgrade. * Let’s wait more. * [Chris Hammett](https://wordpress.org/support/users/clhammett/) * (@clhammett) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551855) * Maybe the plugins will all catch up eventually. Whew. I’m relieved! Thank you. * Moderator [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551953) * If you’re currently suffering from this particular error, [reset your plugins](http://codex.wordpress.org/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F) and upgrade the Podcasting Plugin by TSG to 2.3.10 before reactivating it. * If you don’t have the Podcasting Plugin by TSG, then the problem is being caused by the wordTube plugin. At this time, there is no upgrade or work-around for the wordTube plugin. * [fashionmanaged](https://wordpress.org/support/users/fashionmanaged/) * (@fashionmanaged) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551972) * I don’t have either of those plugins and I’m not experienced enough with WP to do really understand what rlquis. I just want my site back. My error message is: * “Fatal error: Cannot redeclare is_rtl() (previously declared in /home/enhanc10/ public_html/wp-includes/locale.php:347) in /home/enhanc10/public_html/wp-includes/ locale.php on line 349” * Can someone explain to me how to downgrade from this disaster in layman terms please?? I can’t afford to have my site down like this. 🙁 * Moderator [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551973) * fashionmanaged, your problem is the Events Calendar plugin. Reset your plugins as linked to above and don’t reactivate it until the developer releases and upgrade for it. * [dotcompals](https://wordpress.org/support/users/dotcompals/) * (@dotcompals) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551977) * i successfully upgraded one of my installation to 3.0 and its working great.. But, the second installation i tried failed. now i am getting this message * > Fatal error: Cannot redeclare comment_form() (previously declared in /home/ > world8/public_html/rationalthoughts.org/wp-includes/comment-template.php:1484) > in /home/world8/public_html/rationalthoughts.org/wp-content/plugins/google- > transliteration/google_transliteration.php on line 87 * how to recover from this? * I used the automatic upgrade plug in in both cases to upgrade. * [dotcompals](https://wordpress.org/support/users/dotcompals/) * (@dotcompals) * [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551983) * Solved the above by deactivating google-transliteration Plugin. thanks Viewing 12 replies - 1 through 12 (of 12 total) The topic ‘Fatal error after Installing WordPress 3.0’ is closed to new replies. ## Tags * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/) * [wordpress 3.0](https://wordpress.org/support/topic-tag/wordpress-3-0/) * In: [Installing WordPress](https://wordpress.org/support/forum/installation/) * 12 replies * 5 participants * Last reply from: [dotcompals](https://wordpress.org/support/users/dotcompals/) * Last activity: [15 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-wordpress-30/#post-1551983) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics