'Unable to find an entry point named 'TF_StringEncodedSize' in DLL 'tensorflow'.'

i test this sample
[sample](https://github.com/dotnet/machinelearning-samples/blob/master/samples/csharp/getting-started/DeepLearning_ImageClassification_Training/README.md)
with winform application ,
But when i run app in this line

var prediction = predictionEngine.Predict(imageToPredict);

i get this error
System.EntryPointNotFoundException: 'Unable to find an entry point named 'TF_StringEncodedSize' in DLL 'tensorflow'.'

in that sample model is ok and all process run well,
but in my app i got this error .