Title: Error activating plugin
Last modified: December 2, 2021

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# Error activating plugin

 *  Resolved [s1r0n](https://wordpress.org/support/users/s1r0n/)
 * (@s1r0n)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/error-activating-plugin-48/)
 * I get the following error when trying to activate the plugin
    —
 * `
    Warning: Attempt to read property “roles” on bool in /usr/local/lsws/www/lightningpath.
   org/wp-content/plugins/wpforo/wpf-includes/class-members.php on line 1090
 * Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be 
   of type array, null given in /usr/local/lsws/www/lightningpath.org/wp-content/
   plugins/wpforo/wpf-includes/class-members.php:1090 Stack trace: #0 /usr/local/
   lsws/www/lightningpath.org/wp-content/plugins/wpforo/wpf-includes/class-members.
   php(1090): in_array() #1 /usr/local/lsws/www/lightningpath.org/wp-content/plugins/
   wpforo/wpf-includes/class-members.php(1133): wpForoMember->synchronize_user()#
   2 /usr/local/lsws/www/lightningpath.org/wp-content/plugins/wpforo/wpf-includes/
   functions-installation.php(64): wpForoMember->synchronize_users() #3 /usr/local/
   lsws/www/lightningpath.org/wp-content/plugins/wpforo/wpf-includes/functions-installation.
   php(17): wpforo_activation() #4 /usr/local/lsws/www/lightningpath.org/wp-includes/
   class-wp-hook.php(292): do_wpforo_activation() #5 /usr/local/lsws/www/lightningpath.
   org/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters() #6 /usr/local/
   lsws/www/lightningpath.org/wp-includes/plugin.php(484): WP_Hook->do_action() #
   7 /usr/local/lsws/www/lightningpath.org/wp-admin/plugins.php(193): do_action()#
   8 {main} thrown in /usr/local/lsws/www/lightningpath.org/wp-content/plugins/wpforo/
   wpf-includes/class-members.php on line 1090

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Support [gVectors Dev](https://wordpress.org/support/users/gvectorsdevs/)
 * (@gvectorsdevs)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/error-activating-plugin-48/#post-15129302)
 * Hi [@s1r0n](https://wordpress.org/support/users/s1r0n/),
    Go to wp-content\plugins\
   wpforo\wpf-includes, open class-members.php file, find 1090 line, add ` `(array)`
   like it in this screenshot` [⌊2021-12-03_16-57-56⌉](https://www.screencast.com/t/0VoDdph2)
 *  Thread Starter [s1r0n](https://wordpress.org/support/users/s1r0n/)
 * (@s1r0n)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/error-activating-plugin-48/#post-15130903)
 * ya. you need to add the (array) cast to all three instances of $user-roles in
   that if/then loop.
 * Presume this will be fixed in code with the next update?
 *  Plugin Support [gVectors Dev](https://wordpress.org/support/users/gvectorsdevs/)
 * (@gvectorsdevs)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/error-activating-plugin-48/#post-15131520)
 * [@s1r0n](https://wordpress.org/support/users/s1r0n/),
    This will be added in 
   code in the new update

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Error activating plugin’ is closed to new replies.

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 * 3 replies
 * 2 participants
 * Last reply from: [gVectors Dev](https://wordpress.org/support/users/gvectorsdevs/)
 * Last activity: [4 years, 6 months ago](https://wordpress.org/support/topic/error-activating-plugin-48/#post-15131520)
 * Status: resolved