problem in visual stdio 2005 with bison and flex

[eng.sharif]

i want use bison and flex in visual stdio 2005 for make small
compiler by use Custom Build Rules in Visual C++ 2005 "FlexBison.rules
file "

but when i compile "example.y" i get error
------------------------------------------------------------------------------------------
bison.simple: No such file or directory
bison: Project : error PRJ0019: A tool returned an error code from
bison
Project : error PRJ0002 : Error result 1 returned from 'C:\WINDOWS
\system32\cmd.exe'.
Build log was saved at "file://c:\Documents and Settings\sharif.SYNRYU
\My Documents\Visual Studio 2005\Projects\example\example\Debug
\BuildLog.htm"
example - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped
==========