Get OperationFailure error with PyMongo 2.7.1 -


i run operationfailure error pymongo 2.7.1 following code: 

db.business.update(    {'_id': objectid(business_id)},       {         '$set': {'photos.primary': photo_url},         '$push': {'photos.secondary': old_primary_url}       } )

i following error, when primary member has value

<class 'pymongo.errors.operationfailure'>: '$set' empty

has idea tackle this?

best


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