I am using UIPEthernet version 2.0.7 and I did not get the error regarding beginWithDHCP. I am not sure why it’s reporting on line 102, if you look at UIPEthernet.cpp, the reference to beginWithDHCP appears on line 82. Maybe you should re-download the library and try again? Also, make sure in the make file you give the correct path to UIPEthernet: sometimes you may have multiple instances of the same library so make sure it’s pointing to the correct one.