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I have a similar problem
I am trying to install ARIA2.3, which requires me to install Tix to make the GUI work. I downloaded Tix 8.4.3.
When I launch ARIA using the command "aria -g", I get the following message:

Traceback (most recent call last):
File "/Users/davidbernard/Desktop/RMN/aria2.3/aria2.py", line 875, in <module>
run_gui(a['-g'])
File "/Users/davidbernard/Desktop/RMN/aria2.3/aria2.py", line 556, in run_gui
gui.go(project_file)
File "/Users/davidbernard/Desktop/RMN/aria2.3/src/py/aria/gui/gui.py", line 1555, in go
root = Tix.Tk()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tix.py", line 225, in __init__
self.tk.eval('package require Tix')
_tkinter.TclError: dlopen(/usr/local/lib/Tix8.4.3/libTix8.4.3.dylib, 6): no suitable image found. Did find:
/usr/local/lib/Tix8.4.3/libTix8.4.3.dylib: mach-o, but wrong architecture

I have looked at the architecture of the dylib:

lipo -info libTix8.4.3.dylib
Non-fat file: libTix8.4.3.dylib is architecture: x86_64

as well as java's

lipo -info /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
Architectures in the fat file: /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java are: x86_64 i386 ppc7400

java -version
java version "1.6.0_33"
Java(TM) SE Runtime Environment (build 1.6.0_33-b03-424-10M3720)
Java HotSpot(TM) 64-Bit Server VM (build 20.8-b03-424, mixed mode)

I don't understand why it doesn't work, since both seem to be in the same architecture. Please note that I am a newbie, I know very little of informatics. I run on Mac OS X 10.6.8. Can someone help me, please?
 
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