It looks like the twitter api refused to work for iPhone OS4 :( (Twitter+OAuth http://github.com/bengottlieb/Twitter-OAuth-iPhone). When I building the project to which I just add the Twitter+OAuth I see the following:
alt text http://www.freeimagehosting.net/uploads/3ce52c447b.png
It's really really important for me! Any help will be greatly appreciated!
Many thanks in advance!!!!!!!
It seems that there is a binary mismatch between the various object files.
Don't forget that iPhone 4.0 is a new major version, thus it may break ABI (Application Binary Interface). This means that you cannot take a binary object from iPhone 3.0 and link it with a iPhone 4.0 binary object without problems (Note that it may works, but unlikely).
I suggest you to re-build everything from the sources.