404 error on authorpage

Hi everyone,

I dont know if this post belongs here or in the ‘troubleshooting’, but anyways:
Right now I have an wordpress multsite. However the author page (mydomain.com/blog/author/authorname) just leads to a 404 error page.

I searched a lot online but I cant find the answer.

– its not a plugin conflict
– its not a theme conflict
– There’s no “%20” problem in the username
– There’s no space in or after the username

Please help :)!