Title: Fatal error use “markbaker”
Last modified: March 9, 2021

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# Fatal error use “markbaker”

 *  Resolved [Freepress Coop](https://wordpress.org/support/users/freepresscoop/)
 * (@freepresscoop)
 * [5 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/)
 * Hi,
 * When I activate the plugin, I get the following Fatal error on the website:
 *     ```
       PHP Fatal error: Cannot redeclare Matrix\adjoint() (previously declared in /home/grandesamigos/www/wp-content/plugins/visualizer/vendor/markbaker/matrix/classes/src/Functions/adjoint.php:20) in /home/grandesamigos/www/wp-content/plugins/gf-entries-in-excel/vendor/markbaker/matrix/classes/src/functions/adjoint.php on line 20
       ```
   
 * The pluging uses the same code nad crash the site. How can I fix it.
 * WordPress 5.6.2
 * Thanks for your help
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-use-markbaker%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Support [Vytis](https://wordpress.org/support/users/bvytis/)
 * (@bvytis)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/#post-14217360)
 * Hi [@freepresscoop](https://wordpress.org/support/users/freepresscoop/),
 * Thank you for using Visualizer.
 * I see that the error is coming from another plugin, not Visualizer, plugin that
   creates the error is _gf-entries-in-excel_
 * Please try to disable this plugin and then Visualizer should work.
 * I hope it helps!
 *  [Doeke Norg](https://wordpress.org/support/users/doekenorg/)
 * (@doekenorg)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/#post-14217379)
 * Hi [@freepresscoop](https://wordpress.org/support/users/freepresscoop/) and [@bvytis](https://wordpress.org/support/users/bvytis/),
 * The problem here is that both our plugins use the same dependency, but different
   versions. I’ve already patched gfexcel to be compatible with Vizualizer for now.
   And a more permanent fix is provided in a PR to markbaker.
 * So the latest version of gfexcel should be compatible again.
 *  Plugin Support [Vytis](https://wordpress.org/support/users/bvytis/)
 * (@bvytis)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/#post-14217905)
 * Hi [@doekenorg](https://wordpress.org/support/users/doekenorg/),
 * Thank you for investigating it and updating us about the solution, great news!
 *  Thread Starter [Freepress Coop](https://wordpress.org/support/users/freepresscoop/)
 * (@freepresscoop)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/#post-14229543)
 * Hi [@doekenorg](https://wordpress.org/support/users/doekenorg/) and [@bvytis](https://wordpress.org/support/users/bvytis/)
   for the support!
 * I have both plugins installed and active and everything works fine.
 * Great job!
 *  [Doeke Norg](https://wordpress.org/support/users/doekenorg/)
 * (@doekenorg)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/#post-14235880)
 * [@bvytis](https://wordpress.org/support/users/bvytis/) no problem. But I do think
   this will have to be fixed in multiple plugins, including yours.
 * There are now at least 3 plugins that use this dependency through composer. So
   we no longer have a conflict in our plugins (at the moment), but this problem
   still exists for both plugins in combination with that other one, and when only
   one of us decides to update to a newer version when available.
 * The only real solution I see is to change the namespace from this dependency.
   So I’m planning on doing that. Maybe this helps you out too.

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Fatal error use “markbaker”’ is closed to new replies.

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 * 5 replies
 * 3 participants
 * Last reply from: [Doeke Norg](https://wordpress.org/support/users/doekenorg/)
 * Last activity: [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-use-markbaker/#post-14235880)
 * Status: resolved