Error attempting to launch Cloudsim

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Hello,

I am attempting to launch a basic CloudSim instance. I follow the tutorial here: http://gazebosim.org/wiki/Tutorials/CloudSim/setup

But when I get to the following step (actually starting the instance), I get an error I cannot solve. Specifically, I type:

./cloudsim-1.5.0/bin/create_cloudsim.py EMAIL ACCESSKEY SECRETKEY us-east-1a

Where EMAIL, ACCESSKEY, and SECRETKEY are my credentials, as appropriate. The output I get is the following: (my email replaced by EMAIL)

launch_db> c40e527fc/username = EMAIL 

launch_db> c40e527fc/constellation_name = c40e527fc 

launch_db> c40e527fc/gmt = 2013-05-29 20:35:08 

launch_db> c40e527fc/configuration = cloudsim 

launch_db> c40e527fc/constellation_directory = /tmp/tmph8ZJx1cloudsim 

launch_db> c40e527fc/constellation_state = launching 

launch_db> c40e527fc/error =  

Traceback (most recent call last):

  File "./cloudsim-1.5.0/bin/create_cloudsim.py", line 50, in <module>

    machine = cloudsim.cloudsim_bootstrap(username, tmp_fname.name, auto_launch_constellation)

  File "/home/modlabvis5/custom_worlds/cloudsim-1.5.0/cloudsimd/launchers/cloudsim.py", line 538, 

in cloudsim_bootstrap

    constellation_directory, website_distribution)

  File "/home/modlabvis5/custom_worlds/cloudsim-1.5.0/cloudsimd/launchers/cloudsim.py", line 245, 

in launch
    cfg = get_cloudsim_config()

  File "/home/modlabvis5/custom_worlds/cloudsim-

1.5.0/cloudsimd/launchers/launch_utils/launch_db.py", line 247, in get_cloudsim_config

    config = json.loads(s)

  File "/usr/lib/python2.7/json/__init__.py", line 328, in loads

    return _default_decoder.decode(s)

  File "/usr/lib/python2.7/json/decoder.py", line 365, in decode

    obj, end = self.raw_decode(s, idx=_w(s, 0).end())

TypeError: expected string or buffer

I've got all the expected arguments: (email, both keys, and the zone), so I cannot determine what string might be missing. Really no idea what's going on here; any help would be appreciated.

Thanks.