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This thread is resolved. Here is a description of the problem and solution.
I am trying to configure the WPML plugin, at 3rd step there is a blank page.
I have enabled error logging at your site and it’s showing following errors in debug.log file inside wp-content folder.
[09-Oct-2018 10:03:11 UTC] PHP Fatal error: Uncaught Twig_Error_Runtime: No suitable convert encoding function (use UTF-8 as your encoding or install the iconv or mbstring extension). in /home/lookon/public_html/wp-content/plugins/sitepress-multilingual-cms/templates/language-switcher-admin-ui/layout-main.twig:18 Stack trace: #0 /home/lookon/public_html/wp-content/plugins/sitepress-multilingual-cms/vendor/twig/twig/lib/Twig/Extension/Core.php(1234): twig_convert_encoding('\xC5\x9B', 'UTF-16BE', 'UTF-8') #1 [internal function]: _twig_escape_html_attr_callback(Array) #2 /home/lookon/public_html/wp-content/plugins/sitepress-multilingual-cms/vendor/twig/twig/lib/Twig/Extension/Core.php(1095): preg_replace_callback('#[^a-zA-Z0-9,\\....', '_twig_escape_ht...', 'To jest kolejno...') #3 /home/lookon/public_html/wp-content/uploads/cache/wpml/twig/4a/4abb0e40eb009bf5d540b66fa04082b7c111c48a8bd16302f1aa7d46bbfd8b48.php(20): twig_escape_filter(Object(Twig_Environment), 'To jest kolejno...', 'html_attr') #4 /home/lookon/public_html/wp-content/plugins/sitepress-mult in /home/lookon/public_html/wp-content/plugins/sitepress-multilingual-cms/templates/language-switcher-admin-ui/layout-main.twig on line 18
You can fix this issue by enabling mbstring from PHP settings. You need to contact your website hosting support and let them know to enable this for your server / site.