Dear all,

I am working with QGIS version 1.8.0 (Lisboa) and trying to compose a layer 
using three different satellite images (red, green, and blue) using "RGB 
Composition" plugin.

However, I have a problem every time I try to unify this images. I have already 
tried it using different images from different sources, what makes me think 
that the problem is with QGIS. Furthermore, a friend of mine were able to make 
the composition using ArcGIS.

I have already seen this problem reported in some forums, but with no answers 
of how to fix it.
Could you please help me with that? Do you have any insight about that?

Thank you very much.

Here I show the problem:

 
Traceback (most recent call last):
  File "/home/berci/.qgis//python/plugins/rgb/Rgb.py", line 49, in makergb
    
composite.rgb(str(self.pluginGui.comboBox_3.currentText()),str(self.pluginGui.comboBox_4.currentText()),str(self.pluginGui.comboBox_5.currentText()),str(self.pluginGui.lineEdit.text()))
  File "/home/berci/.qgis//python/plugins/rgb/composite.py", line 18, in rgb
    x=r.RasterXSize
AttributeError: 'NoneType' object has no attribute 'RasterXSize'

Versão do Python:
2.7.3 (default, Aug  1 2012, 05:27:35) 
[GCC 4.6.3]


Versão do QGIS
1.8.0-Lisboa Lisboa, exported

Caminho para o Python: ['/usr/share/qgis/python', '/home/berci/.qgis//python', 
'/home/berci/.qgis//python/plugins', '/usr/share/qgis/python/plugins', 
'/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', 
'/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', 
'/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', 
'/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', 
'/usr/lib/python2.7/dist-packages/gst-0.10', 
'/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', 
'/usr/lib/python2.7/dist-packages/ubuntu-sso-client', 
'/usr/lib/python2.7/dist-packages/ubuntuone-client', 
'/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', 
'/usr/lib/python2.7/dist-packages/ubuntuone-couch', 
'/usr/lib/python2.7/dist-packages/ubuntuone-installer', 
'/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol', 
'/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode', 
'/usr/share/qgis/python',
 '/usr/share/qgis/python/plugins/fTools/tools', '/usr/share/qgis/python']
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