I have been having the same problem. It appears to be linked to setting the working directory. <<>>= setwd("c:...") @ Then the error arrives. Any suggestions? -- View this message in context: http://r.789695.n4.nabble.com/Sweave-problem-after-R-update-version-tp4566044p4643363.html Sent from the R help mailing list archive at Nabble.com.