{error, {badarg, [{erlang,iolist_to_binary,[[8216]],[]}, {z_string,to_upper,1,[{file,"src/z_string.erl"},{line,351}]}, {template_meproductions__desktop_home_zotonic_zotonic_priv_sites_meproductions_templates_page_sitemap_tpl, '-render2/2-fun-18-',3,[]}, {lists,mapfoldl,3,[{file,"lists.erl"},{line,1339}]}, {lists,mapfoldl,3,[{file,"lists.erl"},{line,1340}]}, {template_meproductions__desktop_home_zotonic_zotonic_priv_sites_meproductions_templates_page_sitemap_tpl, '-render2/2-fun-19-',3,[]}, {lists,mapfoldl,3,[{file,"lists.erl"},{line,1339}]}, {lists,mapfoldl,3,[{file,"lists.erl"},{line,1340}]}]}}