In App Designer while using startupFcn --- Error using mkdir The filename, directory name, or volume label syntax is incorrect. How to Resolve?

function startupFcn(app)

mkdir "Session Data"

app.vidObj = videoinput('winvideo',app.videoInputNumber);

preview(app.vidObj);

end

[Mario Malic]

It's not a valid MATLAB syntax. Remove the quotation marks and it should work.