old_contents: from django.contrib import admin
  from .models import Cooperator, Student, Professor, ScientificDirector, Profile
  
  # Register your models here.
  admin.site.register(Cooperator)
  admin.site.register(Student)
  admin.site.register(Professor)
  admin.site.register(ScientificDirector)
  admin.site.register(Profile)
new_contents: from django.contrib import admin
  from .models import Cooperator, Student, Professor, ScientificDirector, Profile
  
  # Register your models here.
  admin.site.register(Cooperator)
  admin.site.register(Student)
  admin.site.register(Professor)
  admin.site.register(ScientificDirector)
subject: fix - deleting Profile