sm clone -d --dev https://github.com/ajaxorg/cloud9/tree/master ide
Cloning 'git@github.com:ajaxorg/cloud9.git' to '/root/.sourcemint/repository-cache/git/github.com/ajaxorg/cloud9.git'.
Cloning into 'cloud9.git'...
Enter passphrase for key '/root/.ssh/id_rsa':
remote: Counting objects: 49762, done.
remote: Compressing objects: 100% (15332/15332), done.
remote: Total 49762 (delta 32890), reused 49142 (delta 32391)
Receiving objects: 100% (49762/49762), 87.56 MiB | 1.44 MiB/s, done.
Resolving deltas: 100% (32890/32890), done.
Copying '/root/.sourcemint/repository-cache/git/github.com/ajaxorg/cloud9.git' to '/usb/Development/cloud9/ide'.

  * ERROR ***************************************************************************
  * Error: maxBuffer exceeded.
  * File : child_process.js @ 319 : 13
  * Stack:
  *        at Socket.emit (events.js:67:17)
  *        at Pipe.onread (net.js:362:31)
  * ERROR ***************************************************************************

We had an error cloning.
Try re-cloning which the -d flag to delete the target directory first (or delete yourself and try again).
If cloning keeps failing due to GIT errors you need to resolve these. Like setting up SSH for accessing github.
If cloning seems to fail due to a corrupt git repository or `sm` or `npm` error you can wipe the install cache (~/.sourcemint/*-cache) and try again.
If problems persist email your clone URL to the mailing list for support (must be publicly accessible): http://groups.google.com/group/sourcemint