title: Firebase CLI always shows Error: Invalid project id: \
body: <p>Every time I use a firebase command this error occurs:</p>
  
  <pre><code>...\WEBRTCTest\FirebaseRTC&gt; firebase use --add
  
  Error: Invalid project id: \.
  </code></pre>
  
  <pre><code>\WEBRTCTest\FirebaseRTC&gt; firebase use --clear
  
  Error: Invalid project id: \.
  </code></pre>
  
  <p>The error occured after I accidently run the command:</p>
  
  <pre><code>firebase use \
  </code></pre>
  
  <p>Prior to that all was working fine.</p>
  
  <p>I tried to reinstall firebase-tools using npm and also re-cloning the example project from github.
  Also tried to logout using <code>firebase logout</code> but it gives me the same error:</p>
  
  <pre><code>\WEBRTCTest\FirebaseRTC&gt; firebase use --clear
  
  Error: Invalid project id: \.
  </code></pre>
  
  <p>I´m thankful for any idea as i´m stuck right now.</p>