Please make sure to update to WPML to the latest and check our list of Known Issues before reporting
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This thread is resolved. Here is a description of the problem and solution.
Problem: Invalid site key for the current site Solution: - Please delete your current WPML plugin. - Please go to WPML.org and at https://wpml.org/account/sites/ look for your current key and erase it. - Create a new one with the new URL. Please:: be aware that your domain does not use the www, so add exactly the same URL for generating your key. - Go to Plugins -> Add New and install the WPML again. - Add your new key.
Does it work solve your issue ?
or Please go to https://wpml.org/account/sites/ there you should be able to see your site registered (unless you never register your site before)
then click on the little trash icon create a new key and use it to register the WPML again.