After installing OS X 10.7, Dropbox presented the following error upon loading: "URLs with the type "nwnode:" are not supported". I also got this error from Path Finder (although I don't know what I did to cause it).
Both applications only gave me the error once and have not done it since.
What are nwnode: URLs? What purpose did they serve? And why did Lion stop supporting them?
Best Answer
The error occurs when an application using Python symbol mappings in Mac OS X is not able to connect to a (previously) networked drive, Time Machine, Bonjour, shared or remote drives, etc. (nwnode). It's a depreciated method, which mostly is why Lion displays the error. Even if you don't use Time Machine, this error can occur, either from an os upgrade or app that uses Python (Dropbox in this case).
Usually the issues can be resolved by following these steps (via Apple):
Resolution
http://support.apple.com/kb/TS1736
*note: The question above was posted six months ago, although I decided to answer it today simply because nobody seemed to know the answer. Hopefully someone who reads this will understand what the error means now.
And just for Bryson, here is just one of it's strings in symbol_mappings.py: