Matlab reports an error when trying to use * * * as a function problem, and tries to execute script PCA as a function:

about Matlab An attempt to *** As a function problem, an error is reported , Try to SCRIPT pca Execute as a function :

The cause of the problem

At this prompt , Click the second one and you will see

 Try to  SCRIPT pca  Execute as a function :

I think it is
There is no correct location for adding script files ; So , Cannot call corresponding matlab function

terms of settlement

restart matlab, Open the script to run , When prompted, click on the first selection .