

I installed R-2.9.0 yesterday, and followed the instructions in the R for
Windows FAQ, 2.8 What's the best way to upgrade?  It reads "run
update.packages(checkBuilt=TRUE, ask=FALSE) in the new R and then delete
anything left of the old installation."  I did this but it returned an
error.  It's the checkBuilt=TRUE which causes it, though I don't know why:
leaving it out or changing it to checkBuilt=FALSE do not return errors.

> update.packages(checkBuilt=TRUE, ask=FALSE)
--- Please select a CRAN mirror for use in this session ---
Error: invalid version specification NA

> update.packages(checkBuilt=TRUE)
Error: invalid version specification NA

Peter Keller
Wildlife Biologist
Tetlin National Wildlife Refuge
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