Error while running titledumper on Linux

[2secslater]

https://i.imgur.com/L0MC6H9.png
I am getting this error everytime I run the titledumper on Linux.

If you need, here's my environment:
Ubuntu 18.04 LTS (64-bit)
Linux Kernel 4.15.0-22-generic

[Maschell]

If it's a disc based title consinder using the wud via wudump. You can get extract the file (like the one ddd is dumping) with for example jwudtool (multiplatform) or DiscU (windows only)