Or, in the words of the error message:
Error: Couldn't open texture 'hornetall-b'
referenced by model 'hornet.pof'
File:C:\projects\freespace2\code\Model\ModelRead.cpp
Line: 1802
Call stack:
------------------------------------------------------------------
------------------------------------------------------------------

or when i try running FS2 open...
Error: Unable to swap buffers
Error code: 0
File:J:\src\cvs\fs2_open_3_6_9.final\code\graphics\gropengl.cpp
Line: 1650
[This filename points to the location of a file on the computer that built this executable]
Call stack:
------------------------------------------------------------------
------------------------------------------------------------------