Sharepoint custom display template - Error with some users

I've created my own display template in the folder ../Content web parts/custom

This display template is working fine when I use it (site collection admin). But when a normal user (contribute on the specific site) wants to use it the get the error: "The display template had an error Templates/../custom/blabla.js' not found or has syntax errors"

Must be some permission problem but I cannot figure is out.

Thanks, Mike