Hello anyone, just bought the full package with the QuickInstall, Joomla! 3.8.8
fresh installation, not customized yet.
In administration, once I click on:

Extensions --> Templates --> jd_bizx - Default ---> Template Options

I get this error :
InvalidArgumentException: Please specify a valid response format, other than that of HTML, such as json, raw, debug, etc.

Tried updating to Joomla! 3.9.0 Stable but same error.
(Website has to run on a shared hosting, with PHP version, 5.6.38)

Hello,

There must be a warning or error in the json that's coming on that page.

Please try turning off error reporting to none in your global config and then reloading the page.

Here is how you can work with error reporting: www.joomdev.com/blog/entry/how-to-enable...-and-error-reporting

Thanks,
Chetan