Why am I receiving "Reference to non-existent field 'Execute'" error?

I'm currently working on a project where I compose a report in a word document using activex! I'm stuck on a block of code meant to search the active document for a certain phrase and replace it with another (referencing this post). Below is the section of code I am struggling with:

w.Selection.Find.Font.Size = 10;  % identify features of text to search for
w.Selection.Find.Font.Name = 'Arial';

fail = '!FAIL!'
color = text_color(fail, version, 6)  % color fail message red
search = sprintf('PASS - See Section %s', section)
replace = sprintf('%s - See Section %s', section)

selection = w.Selection
selection.Find.Execute(search,1,0,0,0,0,1,0,1,replace,2,0,0,0,0)  % actual search/replace function

I keep encountering an error during the actual Selection.Find.Execute method that says "Reference to non-existent field 'Execute'. I can't seem to figure out what is causing this problem, or what the defining difference is between my code and the one in the example. I know that in the example, they open and establish the active document in the snippet itself, but I don't believe that is the problem

I'm very new to MATLAB and only have experience with Python, so this is all very new to me. Thank you for being patient!

[Mario Malic]

Did you select anything in the document?

[Cel Kulasekaran]

This is a matter of ActiveX syntax and object organization, you can start the activex com interaction and go line by line, guided with VBA / ActiveX documentation.

See also https://www.mathworks.com/matlabcentral/answers/344080-how-to-use-activex-to-search-word-documents-for-a-phrase-and-delete-the-document#answer_270475