Topic: fatal error - unknown map object type

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JonasG
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Joined: 2025-07-31, 20:49 UTC+2.0
Posts: 1
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Just found this site
 Posted at: Yesterday 21:31 UTC+2.0

Hi I just startet playing widelands and love it! Unfortuanetly, I couple of days ago I tried to load a saved game and the error message below came up. And now I can not start any game - new campain, single map, saved game whatever - always this errror message. I could not find this problem in the forum so I wrote a new post. I hope someone can help. I am using 1.2.1 Release on windows.

[00:01:44.110 real] ERROR:   FATAL EXCEPTION: game class: Unknown map object type 'wasteland_mountain1'
[00:01:44.110 real] ERROR: ##############################
[00:01:44.110 real] ERROR:   Please report this problem to help us improve Widelands.
[00:01:44.110 real] ERROR:   You will find related messages in the standard output (stdout.txt on Windows).
[00:01:44.110 real] ERROR:   You are using version 1.2.1 Release.
[00:01:44.110 real] ERROR:   Please add this information to your report.
[00:01:44.110 real] ERROR:   If desired, Widelands attempts to create an emergency savegame.
[00:01:44.110 real] ERROR:   It is often – though not always – possible to load it and continue playing.
[00:01:44.110 real] ERROR: ##############################
Edited: Yesterday 21:47 UTC+2.0
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hessenfarmer
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Joined: 2014-12-11, 23:16 UTC+1.0
Posts: 2848
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Posted at: Yesterday 21:58 UTC+2.0

Hi JonasG and welcome to the forum,

I just reformatted your post for better readability.

First of all it might help to have some more technical information. So it would be helpful if you open the tab "technical information" in the window "about widelands" accesible from the main menu.
Furthermore the complete output of the console would be helpful.

The error message tells us that a terrain definition is not available anymore. This definition should be located in the datadir at data\world\terrains\wasteland\mountain1.
Please check whether the data still exists there. maybe you did delete something accidentally.

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