Error in file_ext(object) :

[rzzju]

I try to run the following codes in R:

csvFile <- system.file('extdata', 'exampleData.csv', package = 'PanVizGenerator') outputDir <- tempdir() panviz(csvFile, location = outputDir)

But ends up in an error prompt: Error in file_ext(object) : no "file_ext" function.