Undefined function 'extractFileText' for input arguments of type 'char'

Hi, when I try the following command

str = extractFileText('mydocument.pdf');

I get this error

Undefined function 'extractFileText' for input arguments of type 'char'.

Error in untitled (line 4)
str = extractFileText('mydocument.pdf');

Why do I get this error?

How can extract data from my PDF then?

P.S.: my MATLAB version is R2019b.

Answer 1

[Sim]

OK, stupid question since I had not the Text Analytics Toolbox installed - After the installation of that toolbox, it worked well!