For some reason the file
twitter2stata-1.0.4.jar
is not getting installed. You might want to find the ado package, uninstall it, and reinstall it. For example
ado describe, find(twitter)
ado uninstall packageid
net install "http://www.stata.com /users/kcrow/twitter2stata" , replace
If that does not work, I can send you the file.