link : error LNK1218: warning treated as error; no output file generated 请问这是什么错误？

BUILD: Compile and Link for x86
BUILD: Loading d:\winddk\6000\build.dat...
BUILD: Computing Include file dependencies:
BUILD: Start time: Wed Oct 11 15:44:15 2006
BUILD: Examining d:\t_drivercode\firstdr\firstdr directory for files to compile.

BUILD: Saving d:\winddk\6000\build.dat...
BUILD: Compiling and Linking d:\t_drivercode\firstdr\firstdr directory
_NT_TARGET_VERSION SET TO WINXP
Compiling - firstdr.cpp
Linking Executable - obj\i386\firstdr.sys
errors in directory d:\t_drivercode\firstdr\firstdr
link : error LNK1218: warning treated as error; no output file generated
BUILD: Finish time: Wed Oct 11 15:44:31 2006
请link : error LNK1218: warning treated as error; no output file generated 请问这是什么错误？
谢谢

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