Hi Stephen, I updated my yt installation but the error didn't go away. Here is the new error output: //turing/home/tszkali2/yt-ppc64/src/yt-hg/yt/analysis_modules/halo_merger_tree/merger_tree.py:27: DeprecationWarning: the md5 module is deprecated; use hashlib instead import os, glob, time, gc, md5, sys yt ERROR 2011-02-15 19:40:44,354 Couldn't figure out output type for DD0025/DD0025 Traceback (most recent call last): File "MergerTree.py", line 25, in <module> MergerTree(restart_files=files, database=my_database) File "/turing/home/tszkali2/yt-ppc64/src/yt-hg/yt/analysis_modules/halo_merger_tree/merger_tree.py", line 186, in __init__ self._run_halo_finder_add_to_db() File "/turing/home/tszkali2/yt-ppc64/src/yt-hg/yt/analysis_modules/halo_merger_tree/merger_tree.py", line 219, in _run_halo_finder_add_to_db self.period = pf.domain_right_edge - pf.domain_left_edge AttributeError: 'NoneType' object has no attribute 'domain_right_edge' / Any idea? Thanks, Tsz Ka On 2/15/2011 5:52 PM, Stephen Skory wrote:

Hi Tsz Ka,

...

line 219, in _run_halo_finder_add_to_db

...

self.period = self.pf.domain_right_edge -

self.pf.domain_left_edge

...

AttributeError: 'MergerTree' object has no attribute 'pf'

Sorry for the error! I just made a simple fix, and if you update your yt install, it should work now (or fail for an entirely different reason!). Let us know if you have more problems.

Stephen Skory stephenskory@yahoo.com http://stephenskory.com/ 510.621.3687 (google voice)

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