Error creating the log for session &

What causes this issue?

An error occurred whilst converting a log to the specified session.
Refer to the system log and/or the trace files for the exact cause of
the error.

System Response

The system terminates conversion at this point in the program. You will
not lose any logs that have not yet been converted.

How to fix this error?

Verify the rights for your global directory. For each client, the user
creates a directory <Client>bdclg in which the TemSe file wants to
store the new log files. Check that you have sufficient memory space
for this directory. In extreme cases you can use the space made
available by the old files BI<Hostname><Instance>.LOG. Check the space
in the tablespace PSAPBTABD. For each log there is an entry in table
TST01 and in table APQL. Restart the conversion once you have corrected
the cause of the problem. You can do this at the end of the upgrade by
executing report RSBDCLCH.

Error message extract from SAP system. Copyright SAP SE.