Edx Developer Stack error with Vagrant and Ruby

I have a problem in running an instance of edX Platform on my PC. I have followed the intsrunctions which are listed here: http://ift.tt/1qH7XGY I have installed Vagrant 1.7.2 and Oracle VM VirtualBox 4.3.20. However, when I run the command vagrant up I get this error in the command prompt:

[NOTE] You may have encountered a bug in the Ruby interpreter or extension libraries. Bug reports are welcome. For details: This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. I pasted the full log here: http://ift.tt/1BYewia I can't figure a solution. Thanks for any help.