I've got a table that I'm trying to sort.
You need an id on your table, not a class, as specified here:
// Note that all the tables that need to be sorted MUST contain ID tag. // So, if they do not exist, you must create one for each table that // needs to be sorted. Also, the table names/ids MUST BE UNIQUE.
Replace class by id in your severside code that generates the html table.