SAP OLE link server is already active

What causes this issue?

Only one SAP OLE Link Server with a particular name can be active.
You are probably using another R/3 transaction that is using the server
with the same nmae. It is also possible that the SAP OLE Link Server
can occasionally not be deactivated due to an error or crash.

System Response

How to fix this error?

If the SAP OLE Link Server is used by another transaction that is still
running, you should either exit the transaction or start the new one
later.
If a transaction crashes while using teh SAP OLE Link Server, you must
end the session in which it was running. In rare cases where the SAP
OLE Link Server is still running even though you have closed all
sessions, you should restart the host.

Error message extract from SAP system. Copyright SAP SE.