title: Error:(9, 5) error: resource android:attr/dialogCornerRadius not found
body: <p>So I installed android studio 3.0.1 and as soon as it opened the gradle built and showed the following errors. I tried adding dependencies such as design and support but in vain. Could someone help me? 
  Thank you in advance. 
  <a href="https://i.stack.imgur.com/HQnI6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/HQnI6.png" alt="enter image description here"></a></p>
  
  <p>It shows that some attributes such as dialogCornerRadius and fontVariation Settings not found. </p>