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error A10: ATTEMPT TO DEFINE AN ALREADY DEFINED SYMBOL

Phillip Tran

Build target 'Target 1'
assembling STARTUP.ASM...
89C51RE2.H(17): error A10: ATTEMPT TO DEFINE AN ALREADY DEFINED SYMBOL

This is line 17 in the header file
/* BYTE Register */
Sfr (P0 , 0x80);

When I compile modules in Microvision3 I got error
A10 error on the include file header 89c51RxD2.h
If I comment lie 17 out.. I will get error undefine symbol later.

I select the Device as 89C51RE2 in the IDE
It works OK in DOS compilers.

How do I solve this problem?

Thanks