Currently Being ModeratedSep 18, 2013 8:28 AM (in response to brandma4)
More than likely iTunes was set to read the media on the external drive. If this is the case and the drive is not connected when attempting to play music, you will receive these alerts. The other possibly is that iTunes is not directed to where you placed the media on the computer. Here are the best troubleshooting articles that direct you on how to correct this issue.