struct to single conversion for CNN input

Hi,

I am trying to implement CNN on csi data. I have read the .mat files into imds and updated readFcn1 function to read csi data..

The problem is i am getting an error::

net = trainNetwork(imdsTrain,layers,options);

Caused by:

Error using cast

Conversion to single from struct is not possible.

my updated readFcn is ::

function I = readFcn1(digitDatasetPath)

I = load(digitDatasetPath);

I = I.csi_trace;

end

can anyone please help me with the error.

Thanks in advance.