Support » Plugin: WordPress Gallery Plugin - NextGEN Gallery » Conflict with NextGEN Gallery

  • Resolved jpizzolato

    (@jpizzolato)


    I installed the NextGEN Gallery plugin (version 3.12) and immediately began getting the following error:

    Undefined class constant ‘MAJOR_VERSION‘.” After doing some research I found the cause could be a dependency conflict between plugins. I deactivated the NextGEN Gallery plugin and the error went away.

    Has anyone experienced this error using NextGEN Gallery? Does anyone know what the conflict is? I appreciate any help, thanks.

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  • Hi @jpizzolato 👋

    This kind of problem is usually caused by either a conflict with another plugin. The best way to determine this is to:

    1. Disable all plugins except for NexGEN Gallery.
    2. Temporarily switch your theme to a WordPress default one like Twenty-Twenty.
    3. Repeat the action that is causing the problem.

    If you’re not seeing the same problem after completing the conflict test, then you know the problem was with the plugins and/or theme you deactivated. To figure out which plugin is causing the problem, reactivate your other plugins one by one, testing after each until you find the one causing conflict.

    Before you start

    First, please make sure you have a good backup in place of your full site and database.

    Second, I would suggest installing a plugin called Health Check & Troubleshooting. This is a plugin developed by the WordPress community and it allows you to disable plugins without affecting your current site visitors.

    Cheers!

    Thread Starter jpizzolato

    (@jpizzolato)

    Thanks Gabriel, I’ll do what you suggest.

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