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How to solve this warnings?

*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL

SYMBOL: ?C_START
MODULE: .\Objects\STARTUP.obj (?C_STARTUP)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: ?C_START
MODULE: .\Objects\STARTUP.obj (?C_STARTUP)
ADDRESS: 080AH

I check the following link also.

 http://www.keil.com/product/brochures/uv4.pdf - Chapter 6. Creating Embedded Programs.
Page 79 explains how to add a source file.

Regards,