Upgrade from 3.0.2.0 to 4.0.2.3 failing with error

Hi
Upgrade successfully loads patches 1-6 but then get the following error:

index.php?route=upgrade/upgrade:120
SyntaxError: Unexpected token '<', "<b>Error: "... is not valid JSON
OK
<b>Error: INSERT command denied to user 'drurxq193'@'10.6.1.92' for table 'oc_category_path'<br/>Error No: 1142<br/>REPLACE INTO `oc_category_path` SET `category_id` = '33', `path_id` = '33', `level` = '0'</b>: in <b>/vhost/s/i/l/silverantiques.online/www/system/library/db/mysqli.php</b> on line <b>76</b>

Any help would be appreciated - thanks

Derek

The upgrade function will fail in most cases, specially when you have many extensions.

It's better to do a fresh install of your new OpenCart. Also bear in mind that OpenCart 4 is still subject to development changes and bugfixes.

It is not easy to upgrade existing website with 3rd party modules and theme to new version. For this you need to install fresh opencart and migrate all the modules, data, theme, etc for new version.
We can do it if you like.