Fatal error upgrading WPML -> Method WPML_Admin_Menu_Item::__toString() must return a string value

Status

Resolved

Reported for

WPML Multilingual CMS 4.0.0

Resolved in

WPML Multilingual CMS 4.0.2

Overview of the issue

When upgrading WPML, you might encounter the following error:

Catchable fatal error: Method WPML_Admin_Menu_Item::__toString() must return a string value ...

Workaround

This issue will be fixed in the next WPML release.

Until then, you can apply the following fix.

1. Edit the class-wpml-admin-menu-item.php file found in the ../wp-content/plugins/sitepress-multilingual-cms/classes/admin-menu/ folder.

2. Replace the code found in the function serialize() from this:

To this:

All known issues →