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This thread is resolved. Here is a description of the problem and solution.
I am trying to activate WPML but it gives error:
Fatal error: Cannot redeclare icl_get_home_url() (previously declared in /home/dynamicw/rentacar.dynamicwebsites.gr/wp-content/plugins/polylang/modules/wpml/wpml-legacy-api.php:18) in /home/dynamicw/rentacar.dynamicwebsites.gr/wp-content/plugins/sitepress-multilingual-cms/inc/template-functions.php on line 73
It seems that you are trying to activate WPML while Polylang is also activated, this is generating the error. Please deactivate Polylang plugin and then install WPML plugin.
We have another client who had the similar issue and was also able to solve it, this may help in your case:
Here is step by step guide to Activate and register the site with WPML: