Title: Upgrade causing server error 500
Last modified: August 5, 2019

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# Upgrade causing server error 500

 *  Resolved [ectoplasm](https://wordpress.org/support/users/ectoplasm/)
 * (@ectoplasm)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/)
 * Hey,
 * Upgrading to version 3.0.8 caused a server error 500.
 * I temporarily changed the name of the plugin folder to get my site back online.
 * When I try to activate the plugin I get the following error message:
 * Plugin could not be activated because it triggered a fatal error.
 * Parse error: syntax error, unexpected ‘[‘, expecting ‘)’ in /mnt/vol1/home/u/
   l/ultram/public_html/utilso/wp-content/plugins/pretty-link/app/controllers/PrliLinksController.
   php on line 691

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Plugin Author [cartpauj](https://wordpress.org/support/users/cartpauj/)
 * (@cartpauj)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802199)
 * What version of PHP is your site using?
 *  Thread Starter [ectoplasm](https://wordpress.org/support/users/ectoplasm/)
 * (@ectoplasm)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802207)
 * 5.3.3.
 *  Plugin Author [cartpauj](https://wordpress.org/support/users/cartpauj/)
 * (@cartpauj)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802222)
 * Okay, it looks like the [] array notation requires PHP 5.4 or greater. I believe
   WP now requires 5.6.20+ (recommends 7.3+) right now, so you will definitely want
   to contact your host about updating PHP sooner than later.
 * In the meantime, you can revert to a prior version by downloading it at the bottom
   of this page: [https://wordpress.org/plugins/pretty-link/advanced/](https://wordpress.org/plugins/pretty-link/advanced/)
 *  Thread Starter [ectoplasm](https://wordpress.org/support/users/ectoplasm/)
 * (@ectoplasm)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802228)
 * Which version would you recommend?
 *  Plugin Author [cartpauj](https://wordpress.org/support/users/cartpauj/)
 * (@cartpauj)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802297)
 * You’ll probably need the latest 2.x version. You won’t be able to use any of 
   the newer 3.0+ versions until your PHP is updated.
 * [https://downloads.wordpress.org/plugin/pretty-link.2.1.10.zip](https://downloads.wordpress.org/plugin/pretty-link.2.1.10.zip)
 *  Thread Starter [ectoplasm](https://wordpress.org/support/users/ectoplasm/)
 * (@ectoplasm)
 * [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802316)
 * It’s back working again now.
 * Thanks for your help.

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘Upgrade causing server error 500’ is closed to new replies.

 * ![](https://ps.w.org/pretty-link/assets/icon-256x256.png?rev=2503434)
 * [PrettyLinks - Affiliate Links, Link Branding, Link Tracking, Marketing and Stripe Payments Plugin](https://wordpress.org/plugins/pretty-link/)
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 * 6 replies
 * 2 participants
 * Last reply from: [ectoplasm](https://wordpress.org/support/users/ectoplasm/)
 * Last activity: [6 years, 10 months ago](https://wordpress.org/support/topic/upgrade-causing-server-error-500/#post-11802316)
 * Status: resolved