I am using this code which I thought was right.
{exp:search:simple_form channel="work" search_in="everywhere" role="search" id="search-form"}
<label class="screen-reader-text" for="search">Search</label>
<input type="text" value="" name="s" id="search" title="Enter keyword">
<input type="submit" id="search-submit" title="Search it" value="→">
{/exp:search:simple_form}
However I get an error (see attached). Does anyone have any ideas to what I am doing wrong in this case?