Conversion to SVF fails with TranslationWorker-InternalFailure - autodesk-model-derivative

Question

I'm following the tutorial "Extract Data from a Source File." I'm able to upload a file as described, but when I try to convert the file to SVF it fails with "TranslationWorker-InternalFailure." I get the same error with both a 3ds file created with Blender and an f3d created with Autodesk Fusion 360.
Here's my code (python):
r=requests.post(
'https://developer.api.autodesk.com/modelderivative/v2/designdata/job',
headers={
'authorization':'{0} {1}'.format(auth_type,auth_token)
},
json={
"input": {
"urn": urn_cube_base64,
},
"output": {
"formats": [
{
"type": "svf",
"views": [
"2d",
"3d"
]
}
]
}
}
)
print r.json()
while True:
r=requests.get('https://developer.api.autodesk.com/modelderivative/v2/designdata/{0}/manifest'.format(urn_cube_base64),
headers={
'authorization':'{0} {1}'.format(auth_type,auth_token)
},
)
print r.text
rj=r.json()
progress=rj['progress']
status=rj['status']
print rj['status'],progress
if status in ('success','failed','timeout'):
print json.dumps(rj,indent=2)
break
It produces the following output:
{
"hasThumbnail": "false",
"status": "failed",
"derivatives": [
{
"hasThumbnail": "false",
"status": "failed",
"name": "LMV Bubble",
"messages": [
{
"message": "Extractor error code -1073741819",
"code": "TranslationWorker-InternalFailure",
"type": "error"
}
],
"outputType": "svf",
"progress": "complete"
}
],
"region": "US",
"version": "1.0",
"progress": "complete",
"type": "manifest",
"urn": "dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6dG1wX2J1Y2tldDEvY3ViZS4zZHM"
}