Type or namespace could not be found in nopCommerce razor view engine
<p>I'm working on <a href="http://www.nopcommerce.com/" rel="nofollow noreferrer">nopCommerce</a> 3.7 and try to make a <a href="http://docs.nopcommerce.com/display/nc/Creating+a+nopCommerce+plugin" rel="nofollow noreferrer">plugin</a>. But the problem occurs when i add a razor view. I've added dll reference although it says</p>
<blockquote>
<p>The type or namespace name 'xxx' could not be found (are you missing a
using directive or an assembly reference?)</p>
<p>Using directive is unnecessary.</p>
</blockquote>
<p><a href="https://i.stack.imgur.com/eFANo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eFANo.png" alt="enter image description here" /></a></p>
<p>Where i made a mistake ? Or What should i do to remove this warning ?</p>