Hi John,

Sorry to hear you're having trouble!  When you first tried running,
did you source the environment file that yt creates?  I believe for
your environment it would be something like this:

source /home/cosmos/users/jr347/2013/YT/yt-x86_64/bin/activate

which would set the various environment variables and so on.  Then you
can try doing something simple like "yt help" to see if it will import
correctly.

Thanks,

-Matt

On Tue, Jun 4, 2013 at 12:10 PM, John Regan <johnanthonyregan@gmail.com> wrote:
> Hi,
>
> I just installed YT and it's failing at the very start.
>
> Python 2.7.4 (default, Jun  4 2013, 11:02:31)
> [GCC 4.3.4 [gcc-4_3-branch revision 152973]] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from yt.mods import *
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/mods.py", line 60,
> in <module>
>     from yt.data_objects.api import \
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/data_objects/api.py",
> line 31, in <module>
>     from grid_patch import \
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/data_objects/grid_patch.py",
> line 35, in <module>
>     from yt.data_objects.data_containers import YTFieldData
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py",
> line 45, in <module>
>     from yt.data_objects.derived_quantities import GridChildMaskWrapper
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/data_objects/derived_quantities.py",
> line 36, in <module>
>     from yt.utilities.parallel_tools.parallel_analysis_interface import \
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py",
> line 39, in <module>
>     from yt.utilities.lib import \
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/utilities/lib/__init__.py",
> line 35, in <module>
>     from .png_writer import *
> ImportError: libpng16.so.16: cannot open shared object file: No such file or
> directory
>>>>
>
> Adding the path to the libpng16.so.16 library gets me to here (it also seems
> strange that the .so file was not already in the LD_LIBRARY_PATH - is there
> a hint in there somewhere?):
>
> Python 2.7.4 (default, Jun  4 2013, 11:02:31)
> [GCC 4.3.4 [gcc-4_3-branch revision 152973]] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from yt.mods import *
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/mods.py", line
> 129, in <module>
>     from yt.visualization.api import \
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/visualization/api.py",
> line 34, in <module>
>     from plot_collection import \
>   File
> "/nfs/scratch/jr347/2013/YT/yt-x86_64/src/yt-hg/yt/visualization/plot_collection.py",
> line 26, in <module>
>     from matplotlib import figure
>   File
> "/home/cosmos/users/jr347/2013/YT/yt-x86_64/lib/python2.7/site-packages/matplotlib/figure.py",
> line 32, in <module>
>     from matplotlib.image import FigureImage
>   File
> "/home/cosmos/users/jr347/2013/YT/yt-x86_64/lib/python2.7/site-packages/matplotlib/image.py",
> line 22, in <module>
>     import matplotlib._png as _png
> ImportError:
> /home/cosmos/users/jr347/2013/YT/yt-x86_64/lib/python2.7/site-packages/matplotlib/_png.so:
> undefined symbol: png_set_longjmp_fn
>
>
> Anybody come across this kind of error before.
> The code is built on a shared memory machine, using gcc. icc is actually the
> default compiler but the YT script seems to pick up gcc by default and it
> builds (it doesn't build at all with icc).
>
> Install script attached in case it's helpful.
>
> Let me know if you need anymore info. Thanks in advance!
>
> John
>
>
>
>

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