hi i am new with keil when i start to use ADC in lpc2138 , this error appear for me i couldn't solve it " Error: L6218E: Undefined symbol...

hi i am new with keil when i start to use ADC in lpc2138 , this error appear for me i couldn't solve it " Error: L6218E: Undefined symbol main (referred from rtentry2.o)." this is my code : [code] #include #include #include unsigned int read_adc(); void mian() { unsigned int adc_result; char buffer[16]; PINSEL