ambari2.3、hdp3.1.4
install the hue4.8
No module named useradmin.models
Did Hue build successfully first?
It looks like a module dependency. I will give another try on my side with https://github.com/cloudera/hue/tree/release-4.8.0. Did you pick it from there or the tarball release?
Confirmed that above works, so most probably your build failed before.