Sumo error on saving demand file - support needed

[Code-Jelle]

Dear readers,

I cannot save my routes as a demand file, which I made manually in Netedit. It gives the error as seen in the screenshot.
I only have self-learnt programming knowledge, it's not much but enough to do cool things in SUMO.
I am working on a project for my work as a traffic an planning policy advisor.
Included the files, can anyone help me out?

Utrechtseweg v2 - Working file.zip

SUMO-version: 1.21.0

operating system: Windows 11 Home 64-bit (10.0 Build 22631)

[palvarezlopez]

@Code-Jelle Thanks for reporting it! I'm going to check it, but a first quick solution is clicking in file, demands, "save demand element as" and save demands in a new file

[Code-Jelle]

Yeh, that's what I did. That doesn't work. The buttons are greyed out.

[palvarezlopez]

Ok, I check it