[MacRuby-devel] xcode crashed on run button pressed

Hi, I installed macruby 0.11 and created a simple macruby application with xcode 4.3.2 without changing anything. When I pressed the run button, xcode just crashed. Then I switched to macruby nightly build, the same thing happened again. Finally, I built macruby from source code following the instructions in macruby project's readme file but the same problem still existed. Did someone encountered the same problem?