Error - Invalid 18f8520 header file! Vex Robotics Kit

[siaohuang]

First of all I'm a newbie at the Vex Robotics Kit here are the things I've already done

I've successfully installed Mplab v8.10 and C18 compiler v3.35 , I went through the user guides and successfully build the first program, the "Hello World!!" program,so I think my C compiler is working

I downloaded the Vex Starter Code and extracted to a file called "VexCode" I placed it under the directory C:\mcc18\VexCode I opened VexUserCode.mcw (work space) and imported VexUserCode.mcp (project)

I set the Project--> Build options ---> Project and set the Include search path to C:\mcc18\h and C:\mcc18\VexCode
and the Library search path to C:\mcc18\lib and C:\mcc18\VexCode
and Linker script search path to C:\mcc18\VexCode the Linker script is in the VexCode folder 18f8520user.lkr

Then Build all in the output window it shows

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Debug build of project `C:\mcc18\VexCode\VexUserCode.mcp' started.
Preprocessor symbol `__DEBUG' is defined.
Tue Aug 03 03:19:32 2010
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Clean: Deleting intermediary and output files.
Clean: Deleted file "C:\mcc18\VexCode\VexUserCode.mcs".
Clean: Done.
Executing: "C:\mcc18\bin\mcc18.exe" -p=18F8520 /i"C:\mcc18\VexCode" -I"C:\mcc18\h" "user_routines_fast.c" -fo="user_routines_fast.o" -D__DEBUG -Ou- -Ot- -Ob- -Op- -Or- -Od- -Opa-
C:\mcc18\VexCode\ifi_picdefs.h:1289:Error [1099] *** Error - Invalid 18f8520 header file!
Halting build on first failure as requested.
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Debug build of project `C:\mcc18\VexCode\VexUserCode.mcp' failed.
Preprocessor symbol `__DEBUG' is defined.
Tue Aug 03 03:19:32 2010

Can anyone solve this? Thank you for you time!!