How to fix Interface JsonSerializable not found

Fix "Interface 'JsonSerializable' not found" Error on LiteSpeed cPanel Server

✅ Step 1: Enable the JSON Extension

  • Log in to cPanel.
  • Scroll down to the Software section.
  • Click Select PHP Version.
  • Check the current PHP version (it should be 7.4 or higher, preferably 8.1 or 8.2).
  • If it's lower than 7.4, change it to PHP 8.1 or PHP 8.2.
  • In the extensions list, tick (enable) the following:
    • ✅ json
    • ✅ mbstring
    • ✅ intl
    • ✅ pdo
    • ✅ openssl
    • ✅ fileinfo
    • ✅ tokenizer
  • Click Save or Set as Current.

✅ Step 2: Clear Laravel Cache

Since you don’t have SSH access, clear the Laravel cache manually:

  • Go to cPanel → File Manager.
  • Navigate to your SalePro installation folder (e.g., public_html/salepos/).
  • Delete the contents inside the following folders:
storage/framework/cache/* storage/framework/views/* bootstrap/cache/*

Now, refresh your website.

✅ Step 3: Enable PHP JSON Extension via MultiPHP INI Editor

If the error persists:

  • Go to cPanel → MultiPHP INI Editor.
  • Select the correct PHP version used for your site.
  • Ensure that the following settings exist:
extension=json memory_limit = 512M max_execution_time = 300 post_max_size = 128M upload_max_filesize = 128M

Click Save.

✅ Step 4: Reinstall Dependencies via cPanel File Manager

Since you don’t have SSH access, do this manually:

  • Open File Manager in cPanel.
  • Go to your SalePro directory (public_html/salepos/).
  • Delete the following:
vendor/ folder composer.lock file

Upload a fresh copy of the vendor/ folder from a working SalePro installation.

If you have access to a working system, zip the vendor/ folder, upload it via File Manager, and extract it in cPanel.

✅ Step 5: Verify .htaccess Settings

If LiteSpeed caching is causing issues:

  • Go to File Manager → Open .htaccess (in the SalePro root folder).
  • Add these lines at the top:
AddHandler application/x-lsphp81 .php

✅ Final Steps

✔ Enable JSON Extension (cPanel → Select PHP Version).

✔ Clear Laravel Cache (Delete cache files in File Manager).

✔ Ensure PHP 8.1 or higher is selected.

✔ Delete & Re-upload vendor folder if needed.

✔ Check .htaccess (add AddHandler application/x-lsphp81 .php).

Now refresh your site. If it still doesn’t work, read error logs again and resolve other issues. 

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