I am knitting to pdf, but while it is outputting my graphs, it is also outputting the below. How do I stop R from outputting this?

```
##
## Attaching package: 'dplyr'
## The following objects are masked from 'package:stats':
##
## filter, lag
## The following objects are masked from 'package:base':
##
## intersect, setdiff, setequal, union
## Registering fonts with R
Importing fonts may take a few minutes, depending on the number of fonts and the speed of the system.
Continue? [y/n]
## Exiting.
## Arial Black already registered with windowsFonts().
## Arial already registered with windowsFonts().
## Arial Narrow already registered with windowsFonts().

```

Code:

```
```{r, echo=FALSE}
library(dplyr)
library(kableExtra)
library(knitr)
library(extrafont)
font_import()
loadfonts(device = 'win')

x <- seq(1,9,by = 1)

kable(x,format = 'latex', booktabs = T, caption = "A KnitR Kable")
```

```