Using Ruby-On-Rails I have been able to use parseexcel with little trouble. Just today I started to use a script that was working and it now reports "MissingSourceFile: no such file to load — parseexcel'

I installed parseexcel on my Mac. Have used it a few times in the past and now can not get the scripts to find it. I am hoping someone can direct me to where to begin my search, fix, what ever.. I need this to work.
Thanks in advance