A slip-up of adding an extra ” to a string definition highlights an anomaly in Sass which causes it to flag every line of scss code (including comments) with double quotes as an error including the real error lost in the jungle of errors. See example below with ” added to the end of $fontfamily (not easy to spot) and an excerpt of the Sass compiler error message pointing to valid line of code amongst many more misleading messages.
$fontfamily: "Comic Sans MS",Arial,Helvetica,sans-serif!important"←;