avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

friends,

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
An error occurred while uploading the sketch

Im using arduino Uno R3 and getting this error all of a sudden , when i try to upload the code.

everything working fine:

cable, led blinking, tried hitting reset before and after uploading and serial port selection..

but still the problem persists...

what might be the faault? bootloader/board/programmer or ?...

Hey , i have the same problem , did you find any solution??

I had this problem, I was using the HC-05 bluetooth module and got this error when it was connected while i was trying to upload a sketch! Did you try uploading sketch with nothing connected to the board?

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
An error occurred while uploading the sketch

I have the same problem with Arduino Pro clone (ATMega168 16M/5V). I have at least 4 of them and 2 act like this.