Warning when plot via plot_grid whith French Accent about cowplot

[clauswilke]

Works fine without problems for me. Whatever the problem is is not a problem in cowplot.

[hedjour]

Can the system be responsive ?
I work on windows with Latin1 encoding and have this warning :
Warning message:
In grid.Call(L_stringMetric, as.graphicsAnnot(x$label)) :
taille de police inconnue pour le caractère 0x17

The warning occur with this script :

 library(ggplot2)
   library(cowplot)
   toto<- ggplot(data.frame(a=1:5, b = 1:5), aes(a,b)) + geom_point() + labs(title = "é")
   plot_grid(toto)

The problem is obligatory in Cowplot

[YoannMat]

Hello there!

I got the same problem without cowplot, it comes from ggplot2.
Can't you specify something like "warning=F" in your knitR code?