Got mine fixed.  This is what you need to do.  

Go to settings then payroll settings.

Click the edit "pencil" next to Washington Tax

OK NOW....where is says Paid Family Medical Leave.  - For me the rate it shows did not need to be updated however you have to update it anyway....but when i choose the same rate and update the month/year and click save it does NOT save.    SO THIS IS WHAT YOU HAVE TO DO.  First change the rate to something else (anything other than what it is currently) and hit save. THEN go back and change it back to the rate you want with the updated date and click save again.  ----your payroll will now work.  

Let me know how it goes.