Yesterday evening, I installed Netbeans 6.1 since I use Netbeans for my Ruby on Rails development. When developing today, I wanted to use the debugger, but for some reason I couldn’t seem to install the Fast Debugger again. After some research on the Netbeans site, I came accross the answer.
Seems like there is a bug in Netbeans 6.1 that was discovered to late and ended up in the release. It will be fixed in a normal update, for the people that realy need the debugger (I guess every good developer), the fix is easy. Just uninstall the ruby-debug-base gem and install the fast-debugger-ide gem.
Everything is working perfectly now 
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To be more precise you need to uninstall only newer version or ruby-debug-base then 0.10.0, usually 0.10.1. ruby-debug-base gets installed when you are installing ruby-debug gem which depends on ruby-debug-base.
ruby-debug-ide also depends on ruby-debug-base so you need ruby-debug-base in version 0.10.0, so usually:
gem uninstall ruby-debug-base -v 0.10.1
is enough (due to mentioned bug in the NetBeans).
yes, that is true Martin. Thank you for the input. I should have posted it so the users would have a better insight.