Tool Error

[TomClancey]

I get this error:


Heres the last entry in the Debug.txt aswell.

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02.04.07 19:38:44  tool pc 01.00.00.0609 ----------------------------------------------
02.04.07 19:38:44  reference function: _write_to_error_file
02.04.07 19:38:44  reference address: 42ca20
02.04.07 19:38:44  EAX: 0xFFFFFFFE
02.04.07 19:38:44  EBX: 0x001FE501
02.04.07 19:38:44  ECX: 0x0012F2D0
02.04.07 19:38:44  EDX: 0x000002CC
02.04.07 19:38:44  EDI: 0x0012F2D0
02.04.07 19:38:44  ESI: 0x00000000
02.04.07 19:38:44  EBP: 0x0012F1A8
02.04.07 19:38:44  ESP: 0x0012F198
02.04.07 19:38:44  EIP: 0x7C90EB94, C3 8D A4 24 ?????
02.04.07 19:38:44  EXCEPTION halt in .\intermediate_geometry.c,#444: triangle->material_index>=0 && triangle->material_index<old_material_count

I get the above error everytime I try and export a map with water. If I remove the water, the map exports just fine.

I have the water material as:

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waves!$

and the texture is called:

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waves.tif

So if anyone can help me out on why tool is doing this, that would be great.