Challenge of Data Security, Controlling Access to Fields in the Developers Trailhead. I spent well over 2 hours on this exercise. It tells me at this time that the "The 'Account Rating' permission set did not have the appropriate field-level security for the Account object."

By now I have tred every combination of check marks and unchecks, and my work place is chaos. Can someone help me with this seemingly simple task?  

Thanks.

Hello,

 

I need to add a field to the lead detail page which calculates the number of days since the last activity for a lead. This formula would return a number which represents the number of days since the last task has been created, updated or completed. Does anyone know what this formula is?

 

Thanks,

 

Scott