Title: Uncaught Error: Class ‘Duplicator\Installer\Core\Bootstrap’
Last modified: November 5, 2022

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# Uncaught Error: Class ‘Duplicator\Installer\Core\Bootstrap’

 *  Resolved [ronald070](https://wordpress.org/support/users/ronald070/)
 * (@ronald070)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/uncaught-error-class-duplicatorinstallercorebootstrap/)
 * Hi,
 * I use Duplicator 1.5.0., WordPress 6.1 and PHP 7.4 (but with PHP 8 same problem).
 * When I create a backup and try to install/restore this on other site (on same
   server). When starting installer.php I get blank screen and see this PHP error
   in the log:
 * PHP Fatal error: Uncaught Error: Class ‘Duplicator\Installer\Core\Bootstrap’ 
   not found in ../dup-installer/main.installer.php:51
 * Is there a way to solve this?
 * Thanks.

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [ronald070](https://wordpress.org/support/users/ronald070/)
 * (@ronald070)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/uncaught-error-class-duplicatorinstallercorebootstrap/#post-16168695)
 * Ow, BTW… when I use older backup/archive there is no problem. I can install these
   without issues.
 * Problem is only for backups/archives created with Duplicator 1.5.0.
 *  [Cory Lamle](https://wordpress.org/support/users/corylamleorg/)
 * (@corylamleorg)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/uncaught-error-class-duplicatorinstallercorebootstrap/#post-16168995)
 * Hey [@ronald070](https://wordpress.org/support/users/ronald070/)
 * Thanks for the feedback! You might consider trying to build a new archive file.
   It could be that your archive is corrupted.
 * If you would like to submit a [support ticket](https://snapcreek.com/ticket) 
   for this issue we can have a closer look at your setup. Please provide a link
   to this forum thread when submitting the ticket.
 * Hope this helps~

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Uncaught Error: Class ‘Duplicator\Installer\Core\Bootstrap’’ is closed
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 * ![](https://ps.w.org/duplicator/assets/icon-256x256.png?rev=2906985)
 * [Duplicator - Backups & Migration Plugin - Cloud Backups, Scheduled Backups, & More](https://wordpress.org/plugins/duplicator/)
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 * 2 replies
 * 2 participants
 * Last reply from: [Cory Lamle](https://wordpress.org/support/users/corylamleorg/)
 * Last activity: [3 years, 7 months ago](https://wordpress.org/support/topic/uncaught-error-class-duplicatorinstallercorebootstrap/#post-16168995)
 * Status: resolved