Groove shark error: invalid literal for Float (): iii.

Hi all,
I was working on a linear regression program, and when I try to convert the input file data to a float, I got this error.
Groove shark error: invalid literal for float (): iii. I'm using Windows XP SP2.
Here is a picture to better describe my problem…

Error:
Alert
Grooveshark error: invalid literal for float(): iii
Any idea what’s going on?
