prctile function not working

Hello,

I am trying to run the function prctile on Matlab 2018b or 2019a, and get the following error message:

Error using validatestring (line 60)

Second argument must be an array of strings or a cell array of character vectors.

Error in prctile (line 66)

validatestring(method,["exact", "approximate"]);

This is the code I ran (taken from Mathworks help example):

x = normrnd(5,2,1,10);
Y = prctile(x,42)

I just switched to matlab 2018/2019, and was previously using prctile successfully in matlab 2013 and 2016. I have the statsitics and machine learning toolbox installed.

Thank you very much for your help.

Dina

[Walter Roberson]

What shows up for

which -all validatestring

[Dina Lipkind]

C:\Program Files\MATLAB\R2019a\toolbox\matlab\lang\validatestring.m

But in the meantime problem was solved by removing a folder from matlabpath