Please help in completing assignment

You've been given a requirement to keep Contact addresses in sync with the Account they belong to. Use Process Builder to create a new process that updates all child Contact addresses when the address of the Account record is updated. This process:Can have any name.
Must be activated.
Must update Contact mailing address fields (Street, City, State, Post Code, Country) when the parent Account shipping address field values are updated.

hi guys,
help me out in using standard controllers in vf trailhead getting a error of
Challenge not yet complete... here's what's wrong: 
The page does not include a bound owner's email variable for the Contact record
cheers...

Hello All,

I keep getting this error on this question:

Challenge not yet complete... here's what's wrong: 
An update to an account record failed to update the mailing address fields of all child contact records. Make sure that the process is correct and that it is activated.

Screenshot:
https://www.dropbox.com/s/30lrmgz8zogxulf/Screenshot%202015-03-23%2016.09.38.png?dl=0

Screenshot 2:

https://www.dropbox.com/s/5wrdht63l18591b/Screenshot%202015-03-23%2016.10.57.png?dl=0

I have gone over this many times and I would appreciate any help to get through this challenge!!


Thanks!