Call to undefined method Drupal\\quicktabs\\QuickSet::load()

Can you upload the screenshot of the page on which error is coming. Also mention on which drupal 8 branch you have installed the module?

It is installed on Drupal-8.0.5
Path is admin/structure/quicktabs/add

The module still has many parts to port and the development and testing are being for latest 8.x-3.x-dev version of drupal. But I will try to have a look to it in meanwhile.
Thanks for reporting it!

same, using https://simplytest.me/ install drupal 8.0.5 and quicktabs only, can't save or add tabs

Please review for error QuickSet::load fix.

Hi rdatar,

Checked and applied your patch and its working properly.

Thanks,
Gaurav

Hi,

Also checked. Works fine.

Cheers...

thanks , it works very well .patch

Hi rdatar,

I am using your patch its fixed that error but i can't able to add More tabs add tabs. Can u please help me to solve this issue.

Thanks

Same for me, "More Tabs" doesn`t work :(
(Drupal 8.1.3)

Same for me. Appplying the patch gets rid of the error, but clicking the button does not actually perform any noticeable action in the UI.

If you check your dblog after hitting the button, I expect that you will see that there are errors about a missing submit handler

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'quicktabs_more_tabs_submit' not found or invalid function name in Drupal\Core\Form\FormSubmitter->executeSubmitHandlers() (line 111 of D:\Rob\Sites\devdesktop\quicktabs\core\lib\Drupal\Core\Form\FormSubmitter.php).

and a kernel exception due to a missing AJAX callback

Symfony\Component\HttpKernel\Exception\HttpException: The specified #ajax callback is empty or not callable. in Drupal\Core\Form\FormAjaxResponseBuilder->buildResponse() (line 67 of D:\Rob\Sites\devdesktop\quicktabs\core\lib\Drupal\Core\Form\FormAjaxResponseBuilder.php).

That should probably go on a separate related issue, so I will open that one up if someone else hasn't already.

Bumping to major since it prevents the module from working. Also added reference to the issue for the unimplemented AJAX handler.

You can use https://www.drupal.org/project/blocktabs

This issue should be fixed in the latest alpha release.