Server crash on mapchange

[xtrem]

Hello all,
I started my server and he work but only very little maps like cannon, stairz and grangerrink!
atcs dont work!

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4125 files in pk3 files
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ERROR: CMod_LoadBrushSides: bad shaderNum: -1375731706
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----- Server Shutdown (Server crashed: CMod_LoadBrushSides: bad shaderNum: -1375731706) -----
Sending heartbeat to master.tremulous.net
Sending heartbeat to master.tremulous.net
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This is when is start atcs...
How to fix it??? Pls help

[DraZiLoX]

Lol why you want stairz 

[xtrem]

 
Stairz is one of the maps that work... its a very little map...

[DraZiLoX]

Its boring map.

[xtrem]

yes i know that but one of the only maps that work! if i try other maps like highrise9 or atcs or something like this server crash!