Error compiling for board Arduino/Genuino Uno.

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i made simple project. working well. have added "serial.begin(9600);" in void setup (). , when tried compile it, gave error:
code: [select]
collect2.exe: error: ld returned 5 exit status

exit status 1
error compiling board arduino/genuino uno.


when replace "serial.begin(9600);", works again. need see serial monitor.

sorry writing mistakes.

i doubt that's whole error....


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