title: Cannot find contract attachments
body: <p>I tried to launch my Cordapp from IDE. When I make request I get following error:</p>
  
  <blockquote>
    <p>net.corda.core.transactions.MissingContractAttachments: Cannot find
    contract attachments for [com.example.contract.IBuildContract].</p>
  </blockquote>
  
  <p>I read about this problem here: <a href="https://docs.corda.net/api-contract-constraints.html#debugging" rel="nofollow noreferrer">https://docs.corda.net/api-contract-constraints.html#debugging</a></p>
  
  <p>But IDE can find <code>setExtraCordappPackagesToScan</code>. How I can set extra packages or save this problem in other way in corda v3?</p>