What's changing
Starting 
September 18, 2018, AdWords API requests that attempt to target or exclude a 
Placement criterion where the 
url is 
exactly adsenseformobileapps.com will fail and result in a 
CriterionError with reason 
INVALID_PLACEMENT_URL. You can read more about this change in the 
Google Ads help center.
What you should do
Modify your application so that it does not add the above 
Placement criterion via the AdWords API, and review and modify your mobile targeting to achieve your campaign goals. You will no longer be able to exclude all mobile apps from targeting using this 
Placement criterion, but you can refine your mobile app targeting and exclusions using any of the following criteria:
For more details, check out the 
criteria usage grid that indicates which criterion types can be targeted and excluded at the campaign or ad group level. If you have any questions or need help, please contact us via the 
forum.
 - Josh Radcliff, AdWords API Team
 - Josh Radcliff, AdWords API Team