Title: Installing theme with instant WordPress
Last modified: February 10, 2017

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# Installing theme with instant WordPress

 *  [lucas06](https://wordpress.org/support/users/lucas06/)
 * (@lucas06)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/installing-theme-with-instant-wordpress/)
 * Hello
    Can someone tell me why, when I try to install a theme on Instant WordPress,
   I have 9 times on 10 a message error like Fatal error: Call to undefined method
   WP_Customize_Manager::add_panel() in E:\New Folder\InstantWP_4.3\iwpserver\htdocs\
   wordpress\wp-content\themes\sg-window\inc\customize.php on line 11 or Fatal error:
   Call to undefined function is_customize_preview() in E:\New Folder\InstantWP_4.3\
   iwpserver\htdocs\wordpress\wp-content\themes\kurama\functions.php on line 170
   Thanks for your answer

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 * 0 replies
 * 1 participant
 * Last reply from: [lucas06](https://wordpress.org/support/users/lucas06/)
 * Last activity: [9 years, 3 months ago](https://wordpress.org/support/topic/installing-theme-with-instant-wordpress/)
 * Status: not a support question