cam = ONVIFCamera('192.168.22.19', 80, '***', '***')
media = cam.create_media_service()
media.GetSnapshotUri()
Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/local/lib/python2.7/dist-packages/onvif/client.py", line 31,
in wrapped raise ONVIFError(err)
onvif.exceptions.ONVIFError: Profile token does not exist

token = media.GetVideoEncoderConfigurations()
media.GetSnapshotUri(token[0]._token)
Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/local/lib/python2.7/dist-packages/onvif/client.py", line 31,
in wrapped raise ONVIFError(err)
onvif.exceptions.ONVIFError: Unknown error: Method instance argument
after ** must be a mapping, not Text