Edit reading the TADIR entry &1 &2 &3

What causes this issue?

Error reading the TADIR entry &v1& &v2& &v3&.
It is possible that the global TADIR could not be read. The global
TADIR is read via RFC. If the RFC connection can not be established,
the TADIR read terminates.

System Response

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

How to fix this error?

Ask your System manager whether access to the global TADIR is possible
from your System.

Error message extract from SAP system. Copyright SAP SE.