这怎么回事，大神求教！！！

暮色，夕阳

Build target 'Simulator'
compiling main.c...
linking...
*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
    SYMBOL:  MAIN
    MODULE:  .\main.obj (MAIN)
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
    SEGMENT: ?PR?MAIN?MAIN
Program Size: data=30.1 xdata=0 code=1098
Target not created