[horde] Upgrade of Horde from V. 3 to V. 5 failed

[Me]

I am running SME Linux Server which has Horde V3 preinstalled. I have just upgraded to V5 using this:
https://wiki.contribs.org/Horde5


Install went OK, but after install, all my calendar entries are gone.

Details on my error messages can be found here:
(my entry starts on bottom of page 6 and continues on page 7)

https://forums.contribs.org/index.php/topic,50969.75.html