Can't debug my sinatra app with RubyMine

Hey!

I'm quite new to Ruby, so please excuse, if I'm asking a completly silly question here.

It seems to work, but when I'm hitting a breakpoint the debgugger won't stop. All I get is this in the console:

Processing: th l
<threads>
<thread id="1" status="sleep" />
<thread id="3" status="sleep" />
<thread id="4" status="sleep" />
</threads>
Processing: w
<error>
There is no thread suspended at the time and therefore no context to execute 'w'
</error>