Can't Install Taskfeed?
Variable does not exist: PermissionsAssignPermissionSets
SystemPermissionUtilityTest: Variable does not exist: PermissionsAssignPermissionSets
The root cause is that Salesforce did not enable the permission “Enables sub-permissions of Manage Users” for Orgs which had been upgraded from Base Edition to Enterprise Edition.
To resolve this, please contact us or Salesforce Support to request enabling of this feature quoting Case numbers 19493265 and 19733355 as examples.