我第一次使用R Markdown时出现此错误,只是一个简单的测试运行.
---
title: "test"
author: "Lulu"
date: "3/6/2018"
output: html_document
---
```{r}
library(datasets)
data("airquality")
summary(airquality)
```
然后它报告:
output file: test.knit.md
Error: 'is_latex_output' is not an exported object from 'namespace:knitr'
Execution halted
有谁知道如何解决它？