Failed to synchronize cache for repo 'AppStream', ignoring this repo.

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When upgrade from 7.9 to8, the following error occurs.

Message: Unable to install RHEL 8 userspace packages.
Summary:
    Details: Command ['systemd-nspawn', '--register=no', '--quiet', '-D', '/var/lib/leapp/scratch/mounts/root_/system_overlay', 
'--bind=/etc/hosts:/etc/hosts', '--setenv=LEAPP_NO_RHSM=1', '--setenv=LEAPP_EXPERIMENTAL=0', 
'--setenv=LEAPP_COMMON_TOOLS=:/etc/leapp/repos.d/system_upgrade/el7toel8/tools', 
'--setenv=LEAPP_COMMON_FILES=:/etc/leapp/repos.d/system_upgrade/el7toel8/files', '--setenv=LEAPP_ENABLE_REPOS=BaseOS,AppStream', 
'--setenv=LEAPP_UNSUPPORTED=0', '--setenv=LEAPP_EXECUTION_ID=ffb16833-e6c3-494c-bbb5-72e566ed8952', '--setenv=LEAPP_HOSTNAME=BSV10850', 'dnf', 'install', 
'-y', '--nogpgcheck', '--setopt=module_platform_id=platform:el8', '--setopt=keepcache=1', 
'--releasever', u'8.4', '--installroot', '/el8target', '--disablerepo', '*', '--enablerepo', u'AppStream', 
'--enablerepo', u'BaseOS', 'dnf', '--disableplugin', 'subscription-manager'] failed with exit code 1.
    Stderr: Host and machine ids are equal (3d353a2a140642d9bd30cb6ae9fb9ef2): refusing to link journals
            Failed to synchronize cache for repo 'AppStream', ignoring this repo.
            Failed to synchronize cache for repo 'BaseOS', ignoring this repo.
            Error: Unable to find a match: dnf

I using leapp and writing .repo file in "basefile=file:///".
Is this causing the error?

If this is the cause, could you please tell me how to solve it offline?

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