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Problem:

The client is experiencing a fatal error related to Monolog when trying to update to WPML version 4.7. The error messages indicate issues with the MonologLogger class either not being found or having a declaration issue.

Solution:

First, ensure that you are using WPML version 4.6.15 as this version is stable and might not have the issues present in 4.7. If you already use this version or the problem persists, follow these steps:

1. Visit Plugins>Add New>Commercial tab in your WordPress dashboard.
2. Click the Check for updates button to refresh the installer caches.
3. Perform a full site backup.
4. Attempt to upgrade to WPML version 4.7.1 and check if the issue still exists.

If this solution does not resolve the issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If problems persist, please open a new support ticket at WPML support forum for further assistance.