Welcome to the WPML support forum. I will do my best to help you to resolve the issue.
This may be related to the following known issue. It seems to be a conflict issue between WPML and the latest version of the Site Kit by Google plugin. We got a few reports from other clients with the same error.
We have released a new version of WPML(4.6.5). It has included the fix for this bug. Please upgrade to the latest version after a full site backup{mandatory} and make sure the issue is existing or not.
May you have to visit Plugins>>Add New>>Commerical tab and click on the *Check for updates* button to get the WPML automatic upgrade links of the latest version. This step will help us refresh the installer caches.