pgadmin doesn't connect to server

Hi,

I am using postgresql 9.3 on opensuse 13.2.
Last time I used pgadmin is some weeks ago and all seemed to work fine.
No I tried to start it, but I get the answer:
Error connecting to the server: FATAL:  couldn't open file
„base/12640/12391“ ... File or directory does not exist (or similar - I
use a German localisation)
I looked at ~/data/base and found that the directory 12640 exists, and
there I found the files
12391_fsm
12391_vm
Has anybody an idea, what I should do?
Thanks in advance.
Michael