[RASMB] Ultraspin Error Message

[Erin Matthews]

I've recently downloaded Ultrapsin, and started to learn the program by following the tutorial on the Ultraspin homepage.  However, every time I hit "Go" to fit the data I get an error message reading as follows:
" is not a valid floating point value.

Has anyone seen this error message or have any idea what I am doing wrong?  
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