addArray() method

This is a convenience method that allows you to enter the product codes in comma separated format:

basket.addArray('SR1', 'FR1', 'FOO');

alternatively an array of product codes can be supplied to this function like:

basket.addArray(['SR1', 'FR1', 'FOO']);

Errors

'Need to add an array of product codes or a comma separated list of product codes'

This means that the products haven't been specified as above. Please check above to correct the way that you specify the products.