Ошибок в документе нет, но есть 2 предупреждения, связанных с кодировкой, уже перепробывал все что можно.

Предупреждения

Character Encoding mismatch!
The character encoding specified in the HTTP header (utf8) is different from the value in the <meta> element (utf-8). I will use the value from the HTTP header (utf8) for this validation.

Rare or unregistered character encoding detected
The character encoding declared for this document (utf8) is supported by the validator, but may not be widely supported across platforms. For the sake of interoperability, it is best to use a unicode character encoding such as UTF-8, or one of the registered character encodings.
More information on declaring a character encoding on your Web server or in your document can be found on the W3C Internationalization site.

Что сделать, чтоб не было предупреждений