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[on:]

i tried to upload a program code to my arduino just now, but i close the arduino software when it is still uploading.

after that i reopen the arduino software and try to upload a program code and now the problem come:
it show:

 avrdude: stk500_getsync(): not in sync: resp=0x30
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

pls help ! urgent! before i(so stupid) close the software during the process of uploading, everything is OK! but now :'( :'(

using arduino diecimila and windows vista home premium and arduino-0011 Alpha

[Reply #1 on:]

Well, starting with the basics, have you tried reseting your arduino or unplugging it from power, waiting several minutes, and plugging it back in for another try?

[Reply #2 on:]

is this a common error or serious error?

[Reply #3 on:]

I get that error everytime I accidentally hit upload before I hit reset on my sanguino or if I wait too long after it first powers up.  In my case it just means my bootloader only waits 3 seconds for communication from my laptop.  If it doesn't receive anything it starts running my sketch that's already on it and I have to reset it to upload anything.

[Reply #4 on:]

I'm getting the same symptoms although slightly different error codes. Really annoying.

[Reply #5 on:]

Hola a todos! Soy nuevo por acá y quería compartir algo.

Ayer en mis primeras experiencia con arduino (NG) no podía subir el programa a la placa, me daba el siguiente error:
avrdude: stk500_getsync(): not in sync: resp=0x30
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

Y busqué por el foro -incluso en su versión italiana!- pero no había respuestas claras, solamente algunas pistas.
Hasta que encontré esta página:

Learn Electronics using Arduino
http://www.ladyada.net/learn/arduino/

Sitio donde me enteré que me faltaba instalar los siguientes drivers para que todo marchara bien: CDM 2.04.06 WHQL Certified

Info que estaba en la lección 0.

Espero que esto pueda servirle a otros usuarios, salud!