Never mind, it was a user-error! =)
For some reason my putty-session did not write å,ä & ö correctly. From a linux-session it worked.

@sean
No, no problems i any other modules, just this one.

Hi!
Thanks for a simple and configurable module.
I have problems showing swedish characters such as å, ä & ö. Any clues where to start look?
Best regards

Thanks, that did it!

Yes, I did a npm install in the folder and yes, it seems that the parser is installed. I have a folder named ~/MagicMirror/modules/MMM-Skolmaten/node_modules/rss-parser with this content:
.npmignore
.travis.yml
LICENSE
README.md
bower.json
browser.js
dist/
index.js
lib/
package-lock.json
package.json
scripts/
test/

Thanks for looking in to it!

I get the same output log.

Hi!
I have looked a long time for a module like this but I cannot get it to work.
The module just says Laddar… (Loading…) bot no matter how long I wait I dont see anything else than that.
I have tried both with my kids school and also your example.
Please advise what to do next?