TypeError: Parameter to MergeFrom() must be instance of same class: expected ndarray got numpy.ndarray.

I tried to send a numpy array but 
There is an error showing

**TypeError: Parameter to MergeFrom() must be instance of same class: expected ndarray got numpy.ndarray.**

I am running the following command
"python -m grpc_tools.protoc -I protos\ --python_out=. --grpc_python_out=. hello.proto ndarray.proto dtype.proto"

Is there something i am missing.
