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The version of xadmin that you have installed is not compatible with Django 1.7+ It is using the the mimetype argument, which was removed in Django 1.7.
The issue has been fixed in the master branch, but it doesn’t look as if there has been a new release since then.
You could try installing the master branch, but I would be wary of using an app that hasn’t had a release for so long, unless you’re confident debugging issues like this.
Source:stackexchange.com