Importing tex file into Lyx

[Keith Sloan]

My Uni has supplied me with a tex template that they want me to use.
I have tried opening a new Lyx document and then importing the tex file 
but I get an error see attached.
An error occurred while running:
$$s/../MacOS/text2lyx -f "casestudy.tex"
"casestudy.lyx"

I am on Mac Catalina 10.15.7

I note the tex file has near the beginning

%Example of use of Time Domain Astrophysics latex class
\documentclass{tda}

And they are also supplying a file tda.cls

Not sure where to go to diagnose the problem.
Hope somebody can help advise

========== Art & Ceramics ===========
https://www.instagram.com/ksloan1952/

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