A short post as Google wasn’t my friend on this one. Maybe it helps someone else.
A client came to me with a question regarding this message in his Domino logs on his Domino 12.0.1 FP1 server.
Unable to run program repaircleanup: Unable to locate program
He had copied parts of his notes.ini from his other servers which ran on Domino 10. This included the line:
The reason is quite simple: HCL renamed this task in Domino 11 as can be read here: https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0089589
Therefore the solution is also very simple, once you know this. Just replace RepairCleanup by RprCleanup and you’re done.