Library include error

Hello i

  • Device: Arduino Uno with W5100 ethernet shield

I’m trying the Ethernet demo when i compile i got

…Cayenne/BlynkSimpleEthernet.h:18:22: fatal error: Ethernet.h: No such file or directory
#include <Ethernet.h>

i followed step by step guide, something is wrong?

thank you

What Arduino IDE are you using? …try to add #include <ethernet.h> to your sketch file and then compile it.