编译sys时出现如下错误提示,请问根据这个提示如何找到原因？谢谢指教！

E:\PROGRA~1\SYS070~1\sys>call E:\WINDDK\3790\bin\setenv.bat E:\WINDDK\3790 chk WNET  

E:\PROGRA~1\SYS070~1\sys>PREfast.exe build -ceZ
-----------------------------------------------------------------------------
Microsoft (R) PREfast Version 1.5.2400 for 80x86.
Copyright (C) Microsoft Corporation. All rights reserved.
-----------------------------------------------------------------------------
BUILD: Adding /Y to COPYCMD so xcopy ops won't hang.
BUILD: Object root set to: ==> objchk_wnet_x86
BUILD: Compile and Link for i386
BUILD: Examining e:\progra~1\sys070~1\sys directory for files to compile.
    e:\progra~1\sys070~1\sys  
BUILD: Compiling e:\progra~1\sys070~1\sys directory
Compiling - filemon.rc for i386
Compiling - filemon.c for i386
Compiling - filemon.c for i386
BUILD: Linking e:\progra~1\sys070~1\sys directory
Compiling - filemon.c for i386
Compiling - filemon.c for i386
Linking Executable - objchk_wnet_x86\i386\filem.sys for i386
LINK : error LNK1181: cannot open input file 'objchk_wnet_x86\i386\filemon.obj'
BUILD: Done
 
    4 files compiled
    1 executable built - 1 Error
Error: The build command 'build' returned status '1'.