The second post here is related to the first. It could not create the rom (failed) so when it went to open it in the emulator, there was no rom file for it to open. That's normal.
As for the value being out of range, this happens when a data bank has overflowed. Possible causes:
1) You overwrote one of the tilesets with the wrong size graphic, causing there to be too much graphic data in one bank.
2) You added too much music, causing there to be too much music in one bank.
3) You wrote some custom code and one of your code banks got all used up.
My advice is stick real close to the tutorials until you have a handle on these things.