OSError when trying to import StackExchange dump

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We are migrating our SE 1.0 site to AskBot. I've installed askbot successfully. If I try to import the dump on a web browser I get this:

OSError at /import-data/
[Errno 2] No such file or directory: '/var/www/my-site/tmp/tmpQ011U4.upload'

Traceback:

...
  135.         self.file = TemporaryUploadedFile(self.file_name, self.content_type, 0, self.charset)
File "/usr/local/lib/python2.7/dist-packages/django/core/files/uploadedfile.py" in __init__
  64.                 dir=settings.FILE_UPLOAD_TEMP_DIR)
File "/usr/lib/python2.7/tempfile.py" in NamedTemporaryFile
  454.     (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
File "/usr/lib/python2.7/tempfile.py" in _mkstemp_inner
  235.             fd = _os.open(file, flags, 0600)

Exception Type: OSError at /import-data/
Exception Value: [Errno 2] No such file or directory: '/var/www/my-site/tmp/tmpnyH5zD.upload'

If I try to import it via the console I get the following error:

...
cursor.execute(sql, params)
  File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 34, in execute
return self.cursor.execute(sql, params)
  File "/usr/local/lib/python2.7/dist-packages/django/db/backends/postgresql_psycopg2/base.py", line 44, in execute
    return self.cursor.execute(query, args)
django.db.utils.DatabaseError: relation "stackexchange_votetype" does not exist
LINE 1: SELECT (1) AS "a" FROM "stackexchange_votetype" WHERE "stack...