404 - file not found for file: styles/web/sass/fonts when the files are all there

When I Run my app locally I get this error when hitting the save button on one of my pop-ups. I checked for the file on my desktop in the  \theme\styles\web\sass\fonts folder for this branch and all the fonts are there. Has anyone come across this error before? I can’t seem to find anything on this in the Help. I’m using Mendix Studio Pro 8.18.1 404 - file not found for file: styles/web/sass/fonts/siemenssans-roman-webfont.woff
4 answers

Hi Ali,


This error is not likely caused by the missing font files. Perhaps there is some validation being triggered by this form? If a validation feedback action cannot find a member to show to validation feedback on, it shows in a popup like this.


Thank you for the feedback Marius.

I checked all my microflows and I’m not using any validation feedbacks anywhere.

Is there anything else you can think of that I can check? What else can I do to help me debug this error?

Thanks again.


I would also like to now. Have the same problem.

Any solution yet?


I had a similar error (Mx9.6): 404 - file not found for file: resources/font/meta/meta.ttf and I also had the files on my disk.

First thing to try: copy the files (including directory structure) that are located in the THEME folder to the DEPLOYMENT/WEB folder, only to check if the error would then be gone. (The error is actually saying  it can't find the files in the DEPLOYMENT/WEB folder)

This - of course - is not the real solution, since the deployment folder is created when you run the app.

Next thing to do: search for the font (eg. using Visual Studio Code) in all your css-files to see where in the styling the font is used.

In my case, I found the problem and the cause: the url wasn't correct anymore. 
    src: url("./resources/font/meta/meta.woff") format("opentype"),url("./resources/font/meta/meta.ttf") format("truetype")

Hope this helps!