Upgrade check failed from 11.5 to 12.1

Hello PostgreSQL experts,

I am trying to upgrade an instance of PostgreSQL in unix from 11.5 to 12.1.

I got the following error on upgrade verification step.

Is this not allowed?

UNIX:> pg_upgrade -d /hostname/pg/dpoc/data -D /hostname/pg/dpoc/data -b /hostname/pg/PostgreSQL-11.5/bin -B /hostname/pg/PostgreSQL-12.1/bin -p 5432 -P 9432 -c -v
Performing Consistency Checks
-----------------------------
Checking cluster versions
New cluster data and binary directories are from different major versions.
Failure, exiting

________________________________

IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.