Property tree & does not exist

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

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.