stk500_getsync(): not in sync: resp=0xdc

stk500_getsync(): not in sync: resp=0xdc

What does this mean? Any help or ideas on how to fix it?

It means that you haven't looked at the troubleshooting section, like the IDE pointed you to.

It also means that you are in the wrong place.

While PaulS is correct. What it most likely means (which I assume is what you actually want to know) is that you have selected the wrong 'Board' from the 'Tools -> Board' menu.