title: How do I solve "Couldn't start client Rust Language Server" with the Rust VS Code extension?
body: <p>After installing the <code>Rust</code> extension for VS Code, building the project fails with the following error:</p>
  
  <p><a href="https://i.stack.imgur.com/wLnmx.png" rel="noreferrer"><img src="https://i.stack.imgur.com/wLnmx.png" alt="Error Message Displayed by vscode"></a></p>
  
  <blockquote>
    <p>Couldn't start client Rust Language Server</p>
  </blockquote>
  
  
  
  <blockquote>
    <p>Rustup not available. Install from <a href="https://www.rustup.rs" rel="noreferrer">https://www.rustup.rs</a></p>
  </blockquote>
  
  <p>This is in spite of the fact that <code>rustup</code> is installed in the system, and accessible from the VS Code terminal.</p>