r - slidify('index.Rmd') gives Error: is.list(val) is not TRUE -


i copied , pasted rmd section #6 on page http://zevross.com/blog/2014/11/19/creating-elegant-html-presentations-that-feature-r-code/ index.rmd file , tried slidify it. results in error. same happens other example code. there wrong solidify install?

> slidify('index.rmd')   processing file: index.rmd   |................................                                 |  50%   ordinary text without r code    |.................................................................| 100% label: unnamed-chunk-1 (with options)  list of 1  $ echo: num 5   output file: index.md  error: is.list(val) not true >

i received same error. through trial , error, realized line above yaml front matter @ top of slide throwing error (i must have accidentally added one). after deleting line, error stopped.


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