[O] stuck: templates don't work anymore: org-complete-expand-structure-template vs org-insert-structure-template

[Uwe Brauer]

Hi

As I learned, unfortunately for me, 
org-complete-expand-structure-template is gone and has been 
replaced by

org-insert-structure-template 

Now I have, for example,  the following template via customize

("s" "#+begin_src matlab :results output latex :exports results 
:eval never-export   #+end_src")

However, it is not clear to me how to use the new function.

I simply executed it.
org-insert-structure-template

Then it 
asks me for a key, I press s, but org tells me no such template 
does exist.

I am stuck. Please don't tell me I have to rewrite all my 
templates.

Uwe Brauer