KeyError: 'Al.1'

Hello,

The install process crashes with an KeyError: 'Al.1' error message

Scenario :
1- Use the sample data provided in the wiki http://wiki.helioviewer.org/wiki/Installing_Helioviewer.org :
 http://helioviewer.org/jp2/archives/sample-data.tgz

2-Then type "python install.py" in the directory [#helioviewer_install_dir]/install

=> crash

root@inf-helio-test:/var/www/helioviewer_2.4.0/install# python install.py
Traceback (most recent call last):
  File "/var/www/helioviewer_2.4.0/install/helioviewer/installer/gui.py", line 146, in process_images
    process_jp2_images(images, jp2dir, cursor, mysql, self.update_progress)
  File "/var/www/helioviewer_2.4.0/install/helioviewer/jp2.py", line 40, in process_jp2_images
    insert_images(subset, sources, root_dir, cursor, mysql, step_fxn)
  File "/var/www/helioviewer_2.4.0/install/helioviewer/jp2.py", line 73, in insert_images
    source = sources[img["observatory"]][img["instrument"]][img["detector"]][img["measurement"]]
KeyError: 'Al.1'