Peter:
I believe this particular build was tested thoroughly on both a Mac and Windows 7 environment.
Please answer a few questions, so we can decide what might be the cause of your problems:
1) What is the Operating System you are using (Mac, Windows, etc.), and which version of the OS are you using?
2) How are you invoking FITS ... that is, what is the command line argument you are using?
3) How did you install FITS? Did you unzip the distribution to a folder where you have complete rights and do you have execution rights to all files in FITS?
4) What is the exact stack trace of the error. This is the full error message.
5) What type of file are you trying to analyze?
There is a Quick Start guide at:
as well as other details available (more than you really care about) at:
Thanks,
Dave B.