Worcloud2 returns blank image instead of desired output

I am currently trying to use the library wordcloud2 from R to do a project for my university.

I am following the instructions of cran.

I have managed to do the basic tasks

library(wordcloud2)
library(devtools)
wordcloud2(data = demoFreq)

wordcloud2(demoFreq, color = "random-light", backgroundColor = "grey")

however, if I try something more complex, like trying to add a logo

wordcloud2(demoFreq, figPath = "logo.png", size = 1.5,color = "skyblue")

the program returns the image without the word cloud on it (the logo is in the same folder as the R code)

letterCloud(demoFreq, word = "R", size = 2)

does not return anything at all.

I don't know what is wrong with my code, since I am copying the exact instructions of the webpage. Can someone please help me?

I had a similar issue, using wordcloud2 with flexdashboard. In that cas I solved installing version 0.2.2 of wordcloud2, from github, instead of 0.2.1 from CRAN: 'devtools::install_github("lchiffon/wordcloud2")'.