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If this is a new phenomenon, there may be functions in your namespace that are overwriting Zelig functions. In particular, if you have a function called zelig, setx, or sim in your workspace, the corresponding functions in Zelig will not work. Rather than deleting things that you need, R will tell you the following when you load the Zelig library:
Attaching package: 'Zelig' The following object(s) are masked _by_ .GlobalEnv : simIn this case, simply rename your sim function to something else and load Zelig again:
> mysim <- sim > detach(package:Zelig) > library(Zelig)