Title: Schema error
Last modified: August 14, 2026

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# Schema error

 *  Resolved [Innoxius](https://wordpress.org/support/users/innoxius/)
 * (@innoxius)
 * [3 weeks ago](https://wordpress.org/support/topic/schema-error-13/)
 * Yesterday I manually updated WP to version 7.0.4-ro_RO. The plugin was automatically
   updated (I don’t know when) to version 3.4.0. Until today everything worked normally.
   Starting today I get the error message in the admin:
   _Simple Lightbox Fslight:
   rest\_additional\_properties\_forbidden: $schema is not a valid property of Object.
   _If I deactivate the plugin, the message disappears. When it is activated, the
   only problem with the site is that the lightbox effect no longer appears

Viewing 4 replies - 1 through 4 (of 4 total)

 *  [kolo84](https://wordpress.org/support/users/kolo84/)
 * (@kolo84)
 * [2 weeks, 1 day ago](https://wordpress.org/support/topic/schema-error-13/#post-18998218)
 * I’m experiencing exactly the same issue with WordPress 7.1 and Simple Lightbox
   FSLight 3.4.0. The lightbox effect no longer works, and I get this error:
 * > **Simple Lightbox Fslight: rest_additional_properties_forbidden: $schema is
   > not a valid property of Object.**
 *  [kolo84](https://wordpress.org/support/users/kolo84/)
 * (@kolo84)
 * [2 weeks, 1 day ago](https://wordpress.org/support/topic/schema-error-13/#post-18998252)
 * I found the cause of the issue. In `plugin-settings.json`, the following line
   causes the error in WordPress 7.1:
 * `"$schema": "./settings/settings-schema.json",`
 * After removing this line, the error disappears and the lightbox works normally
   again.
 * The `$schema` entry is still present in `settings-schema.json`.
 * It looks like `plugin-settings.json` should not contain `$schema` because it 
   is being validated with `rest_validate_value_from_schema()` and `additionalProperties`
   is set to `false`.
 *  Thread Starter [Innoxius](https://wordpress.org/support/users/innoxius/)
 * (@innoxius)
 * [2 weeks, 1 day ago](https://wordpress.org/support/topic/schema-error-13/#post-18998290)
 * Congratulations on finding the solution. It’s too late for me though. I just 
   installed another plugin this morning.
 *  Plugin Author [Martin von Berg](https://wordpress.org/support/users/martinvonberg/)
 * (@martinvonberg)
 * [1 week, 4 days ago](https://wordpress.org/support/topic/schema-error-13/#post-19002141)
 * Bug was solved with version 3.5.0. Please update. Sorry for the inconvenience.

Viewing 4 replies - 1 through 4 (of 4 total)

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## Tags

 * [bugfix](https://wordpress.org/support/topic-tag/bugfix/)

 * 4 replies
 * 3 participants
 * Last reply from: [Martin von Berg](https://wordpress.org/support/users/martinvonberg/)
 * Last activity: [1 week, 4 days ago](https://wordpress.org/support/topic/schema-error-13/#post-19002141)
 * Status: resolved