title: Could not find a file named "pubspec.yaml" for flutter 1.12.13+hotfix.5
body: <p>my application was working normally with flutter <strong>version1.9.1+hotfix.6</strong> 
  when I upgrade flutter to <strong>version1.12.13+hotfix.5</strong> 
  the error </p>
  
  <blockquote>
    <p>Error generating build_script snapshot: Could not find a file named
    "pubspec.yaml" in<br>
    "C:\Users\t.ghassan\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\analyzer-0.35.4".</p>
  </blockquote>
  
  <p>appears for both the stable channel and the master channel </p>
  
  <p>I didn't use analyzer package in my application </p>
  
  <p>what to do to fix it?</p>
  
  <p>I'm using windows 10 </p>