Build target 'Target 1' linking... *** ERROR L104: MULTIPLE PUBLIC DEFINITIONS SYMBOL: MAIN MODULE: serial.obj (SERIAL) *** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS SEGMENT: ?PR?MAIN?SERIAL *** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL SYMBOL: MAIN MODULE: C:\KEIL\C51\LIB\C51S.LIB (?C_INIT) ADDRESS: 080DH Program Size: data=27.0 xdata=0 code=543 Target not created