title: TYPO3 - Cannot create a new extension with extension builder
body: <p>I tried to create and save a new extension with Extension builder but an error appear :</p>
  <pre><code>Extension could not be saved: PHP Warning: symlink(): File exists in 
  htdocs/public/typo3conf/ext/extension_builder/Classes/Controller/BuilderModuleController.php line 267
  </code></pre>
  <p>this line correspond at this part of code, I don't know if its useful :</p>
  <pre><code>265 if ($usesComposerPath &amp;&amp; !is_link($publicExtensionDirectory)) {
  266            symlink(
  267                PathUtility::getRelativePath(dirname($publicExtensionDirectory), $extensionDirectory),
                  $publicExtensionDirectory
              );
          }
  </code></pre>
  <p>I tried to update my extension builder,
  I defined my file directory in the composer.json like that:</p>
  <pre><code>    &quot;repositories&quot;: [
          {
              &quot;type&quot;: &quot;path&quot;,
              &quot;url&quot;: &quot;public/typo3conf/ext&quot;
          }
      ],
  </code></pre>
  <p>And I made a composer dump-autoload but the issue still persist</p>
  <p>I don't know what's wrong, and I would gladly appreciate any idea.</p>
  <p>thanks you in advance</p>
  <p>Update : solved, it was an error in my path in &quot;repositories :</p>
  <pre><code>    &quot;repositories&quot;: {
          &quot;local&quot;: {
              &quot;type&quot;: &quot;path&quot;,
              &quot;url&quot;: &quot;/home/server/vendor/htdocs/packages&quot;
          }
      }
  </code></pre>