Prerequisite setup done:
1) Parent and child relationship is done via Assign Role relative to the user.
2) Permission is provided for Parent user to allow student role assignment via manage role, Enable Radio button for users as select as "Allow"
Steps to reproduce issue:
1.Parent USer tries to logon on moodle in application
2. Click on Child sub-links to view child info
Expected: It should populate child profile details
Version used: Moodle 3.o
Actual:"unable to view student from parent in moodle 3.0" Error is being displayed instead child profile details. Attached screen shot for the same.