Html validation error: parameter maxlength

When I try to validate HTML on page with scribbler, I got following error:
```
Error: Attribute maxlength is only allowed when the input type is email, password, search, tel, text, or url.
From line 458, column 13; to line 458, column 121
<input id="id_after_right_panel-url" maxlength="255" name="after_right_panel-url" type="hidden" value="cs" />
```