Functions missing from Toolbox

Hello, I am trying to access the "predict()" function that was introduced to the Stats and Machine learning toolbox in 2013:

>>ver

MATLAB Version 9.9 (R2020b)

Curve Fitting Toolbox Version 3.5.12 (R2020b)

Image Processing Toolbox Version 11.2 (R2020b)

Optimization Toolbox Version 9.0 (R2020b)

Signal Processing Toolbox Version 8.5 (R2020b)

Statistics and Machine Learning Toolbox Version 12.0 (R2020b)

Symbolic Math Toolbox Version 8.6 (R2020b)

Wavelet Toolbox Version 5.5 (R2020b)

I currently have MATLAB 2020b with said toolbox installed onto my computer, however whenever I try to use predict(net,X');, 'Unrecognized function or variable 'predict'' is the answer from the prompt.

Is there a way to reinstall the toolbox or access that function directly through the system files?

Thank you

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/427309-classify-requires-at-least-3-arguments#answer_445205 might help

[Luis FigueroaFernandez]

Thank you!