Indeed I had the same issue retrieving system administrator xml file via ANT.

You should mention "Admin" as profile name. your package.xml must be as followed :

<?xml version="1.0" encoding="UTF-8"?>

-

-

Location_Contact__c

CustomObject

-

Location_Contact__c-FSM Location Contact Layout

Layout

-

Admin

Profile

39.0

Indeed I had the same issue retrieving system administrator xml file via ANT.

You should mention "Admin" as profile name. your package.xml must be as followed :

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
  <types>
    <members>Location_Contact__c</members>
    <name>CustomObject</name>
  </types>
  <types>
    <members>Location_Contact__c-FSM Location Contact Layout</members>
    <name>Layout</name>
  </types>
  <types>
    <members>Admin</members>
    <name>Profile</name>
  </types>
  <version>39.0</version>
</Package>