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I've got this error while upgrandin

SyntaxError: Unexpected token < in JSON at position 106 OK {"success":"Patch 1000 has been applied (1 of 10)","next":"index.php?route=upgrade\/upgrade\/next&step=2"}
Deprecated: Directive 'track_errors' is deprecated in Unknown on line 0

If you have console access on your server, see this solution: https://github.com/composer/composer/is ... -531086504 . If not, you'll need to upgrade your PHP version as per: https://github.com/composer/composer/is ... -391007461 . If you don't have access from your host console to upgrade your PHP version, you'll need to contact your host.

As an alternative, you could always take a look at the Github Opencart repository in the maintenance branch for more up-to-date upgrade solutions.