Warning: sprintf(): Too few arguments in \wp-admin\includes\class-bulk-upgrader-skin.php on line 152 error from TGM Plugin Activation. To fixed this error is just need to edit the files describe on the screenshot. To edit just fine the `skin_update_successful` just like the image below. Make sure to remove the `onclick=”%2$s”` codes on 2 elements. Make sure you are editing `class-tgm-plugin-activation.php` as reference.
After the changes you will see no errors on your dashboard. Hope this post helps your end.