Visual PAF file times error

[jiangwenhao3001]

Run the following command
(base) [jiangwenhao@mu01 jiang]$ Rscript /home/jiangwenhao/jiang_workdir/database/Cucumis_TRS/jiang/dotPlotly/pafCoordsDotPlotly.R -i 821r.2r13C.paf -o out -s -t -m 500 -q 500000 -k 7 -l
error：
Error in .External2(C_X11, paste0("png::", filename), g$width, g$height, :
unable to start device PNG
Calls: ggsave -> dev -> png_dev
No traceback available