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[Resolved] OTGS Installer runs but after Setup multiple Fatal WP Error, on Glossar, Settings…

This thread is resolved. Here is a description of the problem and solution.

Problem: PHP Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, cannot access private method WPML_TM_ICL20_Migration_Notices::build_migration_required() in /wordpress/core/6.9.1/wp-includes/class-wp-hook.php:341

Solution: We have identified the root cause of the issue, which is related to a problem that has already been resolved in the latest version of our plugin (4.9.0).

In order to fix the issue, a plugin update is needed.

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This topic contains 16 replies, has 1 voice.

Last updated by mariusS-7 2 months, 3 weeks ago.

Assisted by: Diego Garcia.

Author Posts
February 5, 2026 at 1:14 pm #17796160

Diego Garcia

Good afternoon,

Thank you for providing full access to the staging environment. I can confirm that I was able to log in successfully, and this will allow us to proceed with the investigation under the appropriate conditions.

I will continue analyzing the issue and will provide you with an update as soon as I have any findings to share.

Thank you for your cooperation.
February 9, 2026 at 7:28 am #17803861

Diego Garcia

Good afternoon,

We have identified the root cause of the issue, which is related to a problem that has already been resolved in the latest version of our plugin (4.9.0).

In order to fix the issue on your site, we kindly ask that you update the plugin to the most recent version. This version includes the necessary fix and will ensure the expected functionality moving forward.

For your convenience, I am including below a link with detailed instructions on how to safely update the plugin, as well as a direct link to download the latest version manually if you prefer that approach.

Please do not hesitate to let us know if you require any further assistance.

https://wpml.org/faq/updating-wpml-manually/
https://wpml.org/account/downloads/
February 9, 2026 at 11:17 am #17804764

mariusS-7

Thanx, this solved it.