avrdude stk500_getsync not in sync resp 0x00 for UNO R3

Using Arduino Project Guidance
#1

board suddenly give me this message (avrdude stk500_getsync not in sync resp 0x00) when upload any program

#2

is that programm bigger than 16k, and which operating system do you use?

#3

just googled it and found THIS post, maybe it helps you. Seems to be your problem

#4

You wouldn't happen to using Bluetooth, are you?

#5