I have installed github version 0.8.4, but when i try to fetch something from git, it is showing this message.
Fetching all tracking branches from Queue-iOS
The error message is being thrown by a git credential helper. It is supposed to be a way for git to avoid asking for your username and password on every push (see here).
I don't know why it is dying but, if you want to stop using it (and avoid seeing the error message), delete your system gitconfig file.
On my system (OSX 10.6.8) I did it with: sudo rm /usr/local/git/etc/gitconfig
because the only setting in the file was for the credential helper. Check yours first!
Since you are getting two death messages, you may also have the setting in your own ~/.gitconfig
file or even your project's. Edit those and remove the credential helper block.
As you noted, the problem with the credential helper doesn't stop git from working. The next step is to find out why the helper fails!