Debugger in RubyMine does not stop on breakpoint

Hi,there.
Currently I'm using RubyMine for ruby development.  I've successfully installed the gems needed for debugger.
But when I start debugging a project, I place some breakpoints and choose to debug the ruby file.However, it just go straight to the end.
For example, I wrote a simple file with only 3 lines codes as belows

puts "hello world"

puts "hello world"
puts "hello world"

Each line is added with a breakpoint.But it never stops on any of them.
The output of console is

Fast Debugger (ruby-debug-ide 0.4.17.beta3, ruby-debug-base 0.11.30.pre10) listens on 127.0.0.1:52842
hello world
hello world
hello world

I'm confused and hope someone will come to help.
Thanks a lot!

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