Due to security reasons the use of the following directives in .htaccess files is now prohibited:

AddCharset, AddDefaultCharset, AddEncoding, AddHandler, AddInputFilter, AddLanguage, AddOutputFilter, AddType, BrowserMatch, CookieDomain, CookieExpires, CookieName, CookieStyle, CookieTracking, ErrorDocument, ForceType, Header, LanguagePriority, Redirect, RedirectMatch RedirectPermanent, RedirectTemp, RemoveCharset, RemoveDefaultCharset, RemoveEncoding, RemoveHandler, RemoveInputFilter, RemoveLanguage, RemoveOutputFilter, RemoveType, RequestHeader, RewriteBase, RewriteCond, RewriteEngine, RewriteOptions, RewriteRule, SetEnvIf, SetEnvIfNoCase, SetHandler, SetInputFilter, SetOutputFilter.

Please check your .htaccess files!