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I am not sure, but here it goes:
I think that the INSTALL_rListing.txt file there is an error In lines 38-41: The 'Listing' setting section doesn't have the "Manually set in node template ..." option. It is however explained well afterwards.
1.0 Configuring rListing
- goto 'Administer' >> 'Site configuration' >> 'Listing Settings'
- In the "Node Images" section
- click the radio button "Manually set in node template ..."
Thanks for a great/useful module.