Numbas Error: Numbas couldn't start because the file
settings was not loaded. Check that it's included in
scripts.js.
at Numbas.checkAllScriptsLoaded (https://numbas.mathcentre.ac.uk/test-yourself/product-rule-practice/scripts.js:279:23)
at HTMLDocument.
(https://numbas.mathcentre.ac.uk/test-yourself/product-rule-practice/:58:16)
at e (https://numbas.mathcentre.ac.uk/test-yourself/product-rule-practice/scripts.js:23716:30005)
at t (https://numbas.mathcentre.ac.uk/test-yourself/product-rule-practice/scripts.js:23716:30307)