After logging on to admin in Joomla 5, SP Pagebuilder (v6.8) gives error:
can't access property "data", e.response is undefined
This happens, when SP Pagebuilder admin interface is opened the first time during an admin session. After that the interface opens normally, when tried another time.
In the previous version of SP, the same happened, but the user was also logged out from the backend. The next time after logging on again, the SP interface was working normally.