Property trees &1 and &2 do not exist

What causes this issue?

The SAP system cannot find the property tree specified in your user
parameters. This also applies to the second named property tree.

System Response

The system cannot display the property tree.

How to fix this error?

Select a valid property tree in the specification management hit list
under <LS>Utilities</> -> <LS>Settings</> -> <LS>Property Tree</>.

Procedure for System Administrators

The property tree that is currently selected in specification management
is entered by the SAP system in the <LS>Parameters</> tab as parameter
<LB>ES6</> under <LS>System</> -> <LS>User Profile</> -> <LS>Own Data
</>.

Error message extract from SAP system. Copyright SAP SE.