Title: Fatal Error, Undefined Function….again. Last modified: August 19, 2016 --- # Fatal Error, Undefined Function….again. * [dragonrhapsody](https://wordpress.org/support/users/dragonrhapsody/) * (@dragonrhapsody) * [15 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-undefined-functionagain/) * I’m attempting to install the newest version of WP. This happens to me EVERY SINGLE TIME. And then I wonder why I don’t want to use WP anymore. I get this line when updating: * > Fatal error: Call to undefined function: is_multisite() in /homepages/43/d283890383/ > htdocs/Blog/wp-includes/wp-db.php on line 505 * I’ve tried the manual upgrate which seems to do nothing. * Someone help me please? This is the third time this stupid thing has happened to me, and last time I fixed it by deleting my plugins folder and then installing them again after-ward, but this time no luck!! Viewing 1 replies (of 1 total) * [esmi](https://wordpress.org/support/users/esmi/) * (@esmi) * [15 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-undefined-functionagain/#post-1794018) * [http://wordpress.org/search/Call+to+undefined+function%3A+is_multisite%28%29?forums=1](http://wordpress.org/search/Call+to+undefined+function%3A+is_multisite%28%29?forums=1) Viewing 1 replies (of 1 total) The topic ‘Fatal Error, Undefined Function….again.’ is closed to new replies. ## Tags * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/) * [undefined function](https://wordpress.org/support/topic-tag/undefined-function/) * In: [Installing WordPress](https://wordpress.org/support/forum/installation/) * 1 reply * 2 participants * Last reply from: [esmi](https://wordpress.org/support/users/esmi/) * Last activity: [15 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-undefined-functionagain/#post-1794018) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics