R Markdown Error: 'is_latex_output' is not an exported object from 'namespace:knitr' [duplicate]

问题

This question already has an answer here:

How should I deal with “'someFunction' is not an exported object from 'namespace:somePackage'” error? (1 answer)

Closed 14 days ago.

I have this Error when I first time using R Markdown, just a simple test run.

---
title: "test"
author: "Lulu"
date: "3/6/2018"
output: html_document
---

```{r}
library(datasets)
data("airquality")
summary(airquality)
```

then it reports:

output file: test.knit.md

Error: 'is_latex_output' is not an exported object from 'namespace:knitr'
Execution halted

Does anyone know how to solve it?

回答1:

Not the most current version

You can try update Knitr

install.packages('knitr', repos = c('http://rforge.net', 'http://cran.rstudio.org'),
             type = 'source')

来源：https://stackoverflow.com/questions/49140030/r-markdown-error-is-latex-output-is-not-an-exported-object-from-namespacekn