Ruby on Rails

Does anyone have any insight into why this is happening?

C:\Users\Family\workspace\myapp>rake test
(in C:/Users/Family/workspace/myapp)
C:/Program Files/Ruby187/bin/ruby.exe: illegal switch in RUBYOPT: -F
(RuntimeError)
C:/Program Files/Ruby187/bin/ruby.exe: illegal switch in RUBYOPT: -F
(RuntimeError)
C:/Program Files/Ruby187/bin/ruby.exe: illegal switch in RUBYOPT: -F
(RuntimeError)
Errors running test:units, test:functionals, test:integration!

I'm in Rails 3...

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