Hello, Yesterday when i uploaded the sketch to my arduino uno it worked fine but when today i tried to upload the sketch i got this error avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51 What does that mean ?

Error while uploading

system March 9, 2011, 1:23pm 6

i tried that several times... no use...
Could there be a problem with my arduino board????

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