I think your problem is due to the incompatible encoding.
Check your data file in Command or Terminal window (If you use a MAC computer, you can check your file using vi in terminal. And see whether there is something strange. And similar in Windows, using Command window.)
If you used MS Word, WordPad, etc. to edit your data file: In MS Word, ‘Save as’ your file as a plain text and then select MS-DOS encoding.
I hope this solves your problem.