Problem with installing addon

The version of CS-Cart is 4.17.1.
When I try to upload the add-on’s zip file from my computer, the loader stops, but nothing happens. The modal window that opened to upload the add-on doesn’t close. After that, I go to the add-on’s settings, and when I press Save, it shows ‘Service Unavailable’. The CS-Cart error logs weren’t very helpful. They show undefined constant variables, which already exist in the add-on’s folder.

Try to check server error logs on the server

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