kwalletmanager-14.12.0-1.1.x86_64
kdebase4-runtime-14.12.0-1.1.x86_64

I've upgraded a system from openSUSE 13.2 (x86_64) current state (all available
updates installed) with a working kopete/ kwallet to openSUSE 20150115
(Tumbleweed) (x86_64).

Afterwards I'm no longer able to open my wallet and therefore missing some of
my credentials.

Alt + F2 -> kwalletmanager leads to a window with a closed password store.

A click on the "open" labelled button leads to:

The program "KDE-password manager" has requested to open the password store
"kwallet". Please enter the required password.

This fails and I get displayed:

Failed to open the password store "kdewallet". Please try again.
(Error message: 42: )