Plots not displaying

[Roopali87]

When I run the following command
library(qtl)
library(LinkageMapView)
data(hyper)
outfile = file.path(tempdir(), "hyper.pdf")
lmv.linkage.plot(hyper,outfile,mapthese=c(1,4,6,15))

The output displays as following with no plots being displayed
Required pdf.width = 13.686
Required pdf.height = 4.23313333333333
Using pdf.width = 14
Using pdf.height = 5

Please help me fix this issue. Thank you.