VS2005编译BSP 的Subprojects 时提示 BUILD: [01:0000000022:ERRORE] postlink.bat failed - rc = 1

今天在编译一个Subprojects工程时，总是出现以下提示:

------ 已启动生成: 项目: EAuto657t, 配置: EAuto657t MIPSII Release Platform Builder (_TGTCPU) ------
BUILD: [00:0000000007:PROGC ] Checking for SDK include directory: E:\WINCE600\sdk\CE\inc.
BUILD: [00:0000000008:PROGC ] Scan E:\WINCE600\PLATFORM\EAuto657t\Src\SAMPLES\cim_capture\
BUILD: [01:0000000022:ERRORE]  postlink.bat failed - rc = 1
BUILD: [00:0000000023:PROGC ]                        Files  Warnings  Errors
BUILD: [00:0000000024:PROGC ] Midl                       0         0       0
Build for Windows CE (Release 601) (Built on Aug 17 2006 15:18:52)
File names: Build.log Build.wrn Build.err Build.dat
E:\WINCE600\PLATFORM\EAuto657t\Src\SAMPLES\cim_capture\sources - 1 error(s), 0 warning(s)
========== 生成: 0 成功或最新，1 失败，0 被跳过 ==========

根据提示应该是postlink.bat出现问题了，于是打开该文件，里面是

REM copy the DLL to the flat release directory

IF %WINCEDEBUG% == "retail" GOTO :SETDEBUG
SET RELEASE_TYPE=release
GOTO :END
:SETDEBUG
SET RELEASE_TYPE=debug
:END

copy .\"dbau13xx (mipsii)"\%RELEASE_TYPE%\cim_capture.dll %_FLATRELEASEDIR%

难道里面出问题了，于是把此文件清空，再次编译，没再出现问题了。

解决方法是找到了，可是原理是什么，有哪位路人经过，若知道答案，请告知我，谢谢.