JUX Graphsign - Blank page on backend after upgrading to Joomla 3.8

I've just installed quickstart graphsign template on the server, all was good before I tried to update to the latest Joomla version (3.8, the original version was not up to date). I launched the update after having updated the extensions.
The front-end is OK, but backend is blank after authentication OK.
There is probably an extension which causes the problem, but turning error reporting to 'E_ALL' doesn't help.
I think I could need some help...

Many thanks!
Pierre

It seems to be caused by SP Page Builder which doesn't want to update. Since I rename the folder into the administrator modules, backend work again.
How can I get an updated version of this module in order to the complete template work updated?

Thanks again,
Pierre

Hi,
Many thanks for your quick reply!

The folder concerned is /administrator/modules/mod_sppagebuilder_admin_menu
that I renamed into /administrator/modules/_mod_sppagebuilder_admin_menu

I found a topic here www.joomshaper.com/forums/joomla-3-8 where an update is given.
He tells to replace files in administrator/modules folder after Joomla update, in fact as soon as I recovered access to admin section by renaming the folder, I simply reuploaded the folder extracted from the given zip file to original target. So that the number of files is not exactly the same from original one and updated one.

In the original one, there is files index.php and menu.php not present into the updated, and /tmpl/default_disabled.php + default_enabled.php + index.html as well.

I don't know if this is important...

I'm going to try to just update the present files without replace the entire folder, if this causes a difference. `

I send you the login information in a separate email!

Regards,
Pierre