How to load large model ?

[mak27arr]

When i try load model ( https://nomeroff.net.ua/models/mrcnn/mask_rcnn_numberplate_1000_2019_10_07.h5 )
get error:
TFException: Invalid GraphDef System.AggregateException: 'WriteEncoding=nullode : Primary },EnabledProto)'
My code:
byte[] buffer = System.IO.File.ReadAllBytes(modelfile);
grafCache = new TFGraph();
grafCache.Import(buffer);

Help me(