Previously I can conveniently generate slides with knitr R from .rmd file. But this time I came across an error as listed below (it even doesn't work for the default .rmd file), does anyone know what's wrong with this, I have reinstall Rstudio, but it seems not work. My OS is MAC OS 10.9 and R version is 3.2.2 (2015-08-14).
Error in stri_locate_all_regex(string, pattern, omit_no_match = TRUE, : object 'C_stri_locate_all_regex' not found Calls: ... parse_inline -> -> stri_locate_all_regex Execution halted