Hey there, let's work through this fatal error you're hitting when editing your LinkedIn login module. The root issue is clear: Twig can't locate the template file extension/module/linkedin_logintwig.twig in your admin template directory. Here's how to fix it step by step:

1. Fix the Template Filename Typo (Most Common Cause) #

Look closely at the missing template name: linkedin_logintwig.twig — that's a clear typo. It should almost certainly be linkedin_login.twig (the extra "twig" in the middle shouldn't be there).

• First, verify the actual filename in your admin template directory: navigate to /opt/lampp/htdocs/eCommerce/admin/view/template/extension/module/ and check what the LinkedIn login template is named.
• If the file is indeed linkedin_login.twig, you need to correct the reference in the module's controller code. Open the controller file at admin/controller/extension/module/linkedin_login.php, search for any line that looks like:

  $this->response->setOutput($this->load->view('extension/module/linkedin_logintwig.twig', $data));
  

  Or any code that renders the template, and fix the filename to linkedin_login.twig.

2. Verify the Template File Exists #

If the filename isn't the issue, confirm the template file actually exists in the correct directory:

• Check /opt/lampp/htdocs/eCommerce/admin/view/template/extension/module/ for the template file (whichever name is supposed to be correct).
• If it's missing, the module likely didn't install properly. Reinstall the LinkedIn login module, or manually copy the template file from the module's installation package to this directory.

3. Clear OpenCart's Caches #

OpenCart caches modified files and Twig templates, so even after fixing the issue, old cached data might still cause errors:

• Clear modification cache: Go to /opt/lampp/storage/modification/ and delete all files/folders inside. Then log into your OpenCart admin, go to Extensions > Modifications, and click the Refresh button to rebuild the cache.
• Clear Twig cache: Navigate to /opt/lampp/storage/cache/twig/ and delete all files here. This forces Twig to recompile fresh template files.

4. Check File Permissions #

Sometimes web servers can't read template files due to incorrect permissions:

• Set the directory permissions to 755 and file permissions to 644 using these commands (adjust the filename to match your actual template):

  chmod -R 755 /opt/lampp/htdocs/eCommerce/admin/view/template/extension/module/
  chmod 644 /opt/lampp/htdocs/eCommerce/admin/view/template/extension/module/linkedin_login.twig
  

5. Confirm Module Compatibility #

If you're using a third-party LinkedIn login module, make sure it's fully compatible with OpenCart 3.0.3.1. Older modules might have incorrect path references or template structures that don't work with OC3. If this is the case, reach out to the module developer for an updated version, or adjust the template paths manually to fit OC3's structure.

内容的提问来源于stack exchange，提问作者Anshu