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Thanks, Luke, for having a look to it. Sure, I can give you some reproducible example -- even in two degrees of completeness ;-): see below. Thanks again, Peter %----------------------------------- (I) first example %----------------------------------- Just to reproduce the error, on r-devel, try: install.packages("RobAStRDA") require(RobAStRDA) getFromNamespace(".RMXE", ns

...s error. If you do f <- getFromNamespace(".RMXE", ns ="RobAStRDA")[["GEVFamily"]][["fun.N"]][[1]] g <- get("fct", environment(f)) and look at the byte code for g with compiler::disassemble or the utility I'll paste in below you get > getbc(g) list(8L, BCMISMATCH.OP) The only way you can get a file like this is to byte compile and save in a version of R with a newer byte code version (the 8L) and then load and resave in an older version of R. If you load and run this code in an older (or newer) version of R it will revert to the stan...