Dear list, I'm using the 'rtracklayer' package and ran into some problems. #=========== library(rtracklayer) browserSession()->toto browserView(toto) #=========== Above codes work well and show the right webpage. however the following code (the last statement) does not work and give the error of 'Error in shell.exec(url) : file name conversion problem' #=========== browserSession()->toto ucscTrackModes(toto)->togai tracks(toto)->toto2 tracks(togai)<-sample(toto2,3) browserView(toto,track=togai) #=========== Any suggestions? Thanks! sessionInfo() R version 2.8.0 (2008-10-20) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 attached base packages: [1] grid tools stats graphics grDevices utils datasets methods base other attached packages: [1] Rgraphviz_1.18.1 graph_1.20.0 rtracklayer_1.2.1 RCurl_0.91-0 Biobase_2.2.1 loaded via a namespace (and not attached): [1] Biostrings_2.10.2 cluster_1.11.11 IRanges_1.0.3 lattice_0.17-15 Matrix_0.999375-16 rJava_0.6-0 [7] XML_1.98-1 LiGang