Rsync Task: Python errors when adding Extra Options

I created a dozen or so rsync tasks early in the testing process, and they worked/continue to work; something  has changed. 

i CAN create a new rsync task 

but i CANNOT add anything to the extra options field without it giving me a python/middleware error, see attached for both the error and the expanded error

happens on any new task, whther it has ACL next to the share name or not

This did not happen on the prior dozen tasks created using the extra options field 

i have made many changes since the original tasks were created so im not sure what could have caused this.  i enabled shadow copies on some of the datasets but this happens on datasets where it is not enabled.

But it is reproducable 

Also once it decides it cant save the task with anything in the extra field, even if you delete everything from the field, it still gives the same error when you attempt to save.  If you refresh the page then it no longer gives the error until you type something in the extra options field again.

The options i am trying to use are more or less identical to the other tasks, ie

--password-file=/mnt/tank/rsync.pwd,--log-file=/mnt/tank/rsync_logs/rsync_backup.log