Markdown Report Not Executing in Rstudio

I am generating the error:

> options(encoding='UTF-8'); require(knitr); knit('March-2013-Report.Rmd');
Loading required package: knitr


processing file: March-2013-Report.Rmd
  |......................                                           |  33%
  ordinary text without R code

  |...........................................                      |  67%
label: unnamed-chunk-1
Quitting from lines 4-5 (March-2013-Report.Rmd) 
Error in evaluate(code, envir = env, new_device = FALSE, stop_on_error = if (options$include) opts_knit$get("stop_on_error") else 2L) : 
  unused argument(s) (new_device = FALSE, stop_on_error = if (options$include) opts_knit$get("stop_on_error") else 2)
Calls: knit ... process_group.block -> call_block -> block_exec -> in_dir -> evaluate

Execution halted

knitr terminated with status 1

when using RSTudio to knit the following code contained within a .Rmd file:

March 2013 - UGA Google Analytics Report
========================================================

```{r}
2+2
```



## About this Report


## Future Vision for GA and Web Reporting


## Analysis



### Basic Page Stats

I usually can debug my errors and am sure that this is something obvious, but what am I doing wrong and why doesn't this compile?

Thanks in advance.

UPDATE: Session Info

> sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] plyr_1.7.1      stringr_0.6.1   rga_0.8         httr_0.2        lubridate_1.2.0
[6] rjson_0.2.10    RCurl_1.95-1.1  bitops_1.0-4.1 

loaded via a namespace (and not attached):
[1] codetools_0.2-8 digest_0.5.2    evaluate_0.4.2  formatR_0.6     knitr_1.1.8    
[6] tools_2.15.0

回答1:

My guess would be that it's an issue with outdated packages. Can you try updating? In RStudio, under the packages tab, you should have an option to update any packages which are in need.

回答2:

Try clearing the knitr cache - if any of the chunks have cache=TRUE

I usually face this problem while Knit'ng where a few of the code chunks have cache=TRUE