By design, MySQL restricts datasets to a maximum schema size of 64K which is actually 16K characters. Right now, your output dataset schema is more than 64k, so that’s why this error is thrown.
Please go to the schema settings of the output dataset and shrink the values of the columns. I’ve attached a screenshot of the schema settings and where you are supposed to change the value. Please note that this will most likely take a bit of trial and error, so you would have to adjust the values in a few columns and then re-run recipe to see if the error is thrown again.