Hi,
I have a problem with Eagle.When I ADD new components in the shematic and I check the ERC I receive the answer that "board and schematic are not consistent" and when I look in the board file there is no package inserted.What I do wrong?...I'am a beginner:
delete your board(in control panel window, right click->delete), and go to the file menu in the schematic and choose switch to board, this will create a new board which will be consistent with your schematic.
Don't ever open and edit your board without the schematic being open aswell to prevent this from happening again.