An error on loading a game: "did not find required token: entry_name"

[andreasdr2]

Im playing a game with 2 friends which I HAVE been able to load before. But now it doesn't work at all.
When typing:

civserver -f matklas.gz

i get the message:

This is the server for Freeciv version 1.13.0
You can learn a lot about Freeciv at http://www.freeciv.org/
2: Loading saved game: matklas.gz
0: Did not find required token: entry_name
0: file "matklas.gz", line 3215, pos 0
0: looking at: '2: Now accepting new client connections.'
0: original line: '2: Now accepting new client connections.'

Is this because I have overwritten the old game with the same name? (which is what I suspect)
Otherwise, what is the problem?

I'm thankful for any help!

[Per]

"Freeciv version 1.13.0"

Try using a newer version. Latest stable version is 1.14.0.