title: Error (#8) An internal server error. Yii framework
body: <p>I'm working on Yii2 project from external server. On that server everything work. But when I try to start it locally I get this error on first page. </p>
  
  <pre><code>Error (#8)
  An internal server error occurred.
  </code></pre>
  
  <p>All other pages work except backend page. There I get the same error.
  How can I fix it?</p>