Django loaddata error doesn't show message

I have Mezzanine app and my purpose is to move data from sqlite3 to prostgres. I found this solution which solved some erors. But now I have something wrong again and can't understand what actually happend because I got just name of error django.db.utils.DataError. Here is full Traceback:

manage.py loaddata dump.json

Traceback (most recent call last):
  File "D:\GitRepos\newbesturfu\manage.py", line 14, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 444, in execute
    output = self.handle(*args, **options)
  File "C:\Python27\lib\site-packages\django\core\management\commands\loaddata.py", line 60, in handle
    self.loaddata(fixture_labels)
  File "C:\Python27\lib\site-packages\django\core\management\commands\loaddata.py", line 90, in loaddata
    self.load_label(fixture_label)
  File "C:\Python27\lib\site-packages\django\core\management\commands\loaddata.py", line 147, in load_label
    obj.save(using=self.using)
  File "C:\Python27\lib\site-packages\django\core\serializers\base.py", line 173, in save
    models.Model.save_base(self.object, using=using, raw=True)
  File "C:\Python27\lib\site-packages\django\db\models\base.py", line 738, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "C:\Python27\lib\site-packages\django\db\models\base.py", line 803, in _save_table
    forced_update)
  File "C:\Python27\lib\site-packages\django\db\models\base.py", line 853, in _do_update
    return filtered._update(values) > 0
  File "C:\Python27\lib\site-packages\django\db\models\query.py", line 580, in _update
    return query.get_compiler(self.db).execute_sql(CURSOR)
  File "C:\Python27\lib\site-packages\django\db\models\sql\compiler.py", line 1062, in execute_sql
    cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
  File "C:\Python27\lib\site-packages\django\db\models\sql\compiler.py", line 840, in execute_sql
    cursor.execute(sql, params)
  File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "C:\Python27\lib\site-packages\django\db\utils.py", line 97, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
django.db.utils.DataError

I use Windows 10, Django 1.8.3 and PostgreSQL 9.4.

Does anyone know how to show full error message or may be know how to get rid of this issue?