Hi,
I am trying to convert Centos to RHEL 8 by following https://access.redhat.com/articles/2360841
and on executing this command, I am getting error:
convert2rhel --disable-submgr --enablerepo dvd-BaseOS --debug

I am getting this error:
[01/01/2021 10:29:22] DEBUG - Calling command 'yum install -y --disablerepo=* --enablerepo=dvd-BaseOS kernel-4.18.0-240.el8'
Failed loading plugin "spacewalk": No module named 'up2date_client'
Last metadata expiration check: 0:30:01 ago on Fri Jan 1 09:59:21 2021.

Dependencies resolved.

Package Arch Version Repository Size

Installing:
kernel x86_64 4.18.0-240.el8 dvd-BaseOS 4.3 M
kernel-core x86_64 4.18.0-240.el8 dvd-BaseOS 30 M
kernel-modules x86_64 4.18.0-240.el8 dvd-BaseOS 26 M
Removing:
kernel x86_64 4.18.0-147.3.1.el8_1 @anaconda 0
kernel-core x86_64 4.18.0-147.3.1.el8_1 @anaconda 58 M
kernel-modules x86_64 4.18.0-147.3.1.el8_1 @anaconda 20 M

Transaction Summary

Install 3 Packages
Remove 3 Packages

Total download size: 60 M
Downloading Packages:
Error opening file for checksum: /media/rhel8dvd/BaseOS/Packages/kernel-4.18.0-240.el8.x86_64.rpm
Package "kernel-4.18.0-240.el8.x86_64" from local repository "dvd-BaseOS" has incorrect checksum
Error opening file for checksum: /media/rhel8dvd/BaseOS/Packages/kernel-core-4.18.0-240.el8.x86_64.rpm
Package "kernel-core-4.18.0-240.el8.x86_64" from local repository "dvd-BaseOS" has incorrect checksum
Error opening file for checksum: /media/rhel8dvd/BaseOS/Packages/kernel-modules-4.18.0-240.el8.x86_64.rpm
Package "kernel-modules-4.18.0-240.el8.x86_64" from local repository "dvd-BaseOS" has incorrect checksum
Error: Some packages from local repository have incorrect checksum
Verifying that RHEL kernel has been installed
[01/01/2021 10:29:23] CRITICAL - No RHEL kernel installed. Verify that the repository used for installing kernel contains RHEL packages.
[01/01/2021 10:29:23] DEBUG - Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/convert2rhel/main.py", line 89, in main
post_ponr_conversion()
File "/usr/lib/python3.6/site-packages/convert2rhel/main.py", line 190, in post_ponr_conversion
pkghandler.preserve_only_rhel_kernel()
File "/usr/lib/python3.6/site-packages/convert2rhel/pkghandler.py", line 440, in preserve_only_rhel_kernel
verify_rhel_kernel_installed()
File "/usr/lib/python3.6/site-packages/convert2rhel/pkghandler.py", line 565, in verify_rhel_kernel_installed
"No RHEL kernel installed. Verify that the repository used for installing kernel contains RHEL packages.")
File "/usr/lib/python3.6/site-packages/convert2rhel/logger.py", line 105, in critical
sys.exit(msg)
SystemExit: No RHEL kernel installed. Verify that the repository used for installing kernel contains RHEL packages.

WARNING - Conversion process interrupted and manual user intervention will be necessary.