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ADC Error message

Rebuild target 'Target 1'
assembling startup_TM4C123.s...
compiling adc.c...
adc.c(39): warning:  #1-D: last line of file ends without a newline
  }
adc.c: 1 warning, 0 errors
linking...
.\adc.axf: Error: L6218E: Undefined symbol SystemInit (referred from startup_tm4c123.o).
.\adc.axf: Error: L6218E: Undefined symbol main (referred from rtentry2.o).
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 2 error messages.
".\adc.axf" - 2 Error(s), 1 Warning(s).
Target not created