3D CNN target vector

I have created a 3D CNN in MATLAB 201a.

My 3D - input size is 16x1280x3x42662 - height x width x depth x n:of observations. My target vector is a categorical array of size: 42662x1.

While I train, I get an error: "Number of observations in X and Y disagree." Can someone please help me on where I am going wrong.

Thanks for your time and help.

[KSSV]

Huumh.....the trainNetwork is pretty confusing thing. Are you folloiwng the below link?

https://in.mathworks.com/help/deeplearning/ref/trainnetwork.html

[Venkat]

Yes, I am.

[Srivardhan Gadila]

Is the network's output size "42662x1" excluding the number of observations?

[Huynh Quoc Viet]

I have the same problem, someone know how to fix it. Please!

[cl h]

modify u train set, size 16x1280x3x1x42662, train data should be 4D,not 3D