Upgrading From v2012 to v2017 Invalid Namespace

I'm trying to do an in-place upgrade from SQL Server 2012 to SQL Server 2017. The process appears to get almost to the end then errors out with 'Invalid namespace'.

The installer log file shows the error:

'Attempting to uninstall MOF file for namespace \\.\root\Microsoft\SQLServer\ReportServer\xxxxxx Management exception: InvalidNamespace encountered.'

Reporting Services is not installed on this server and I didn't select any option to insall it, so I don't know why this issue is coming up.

If I run Reporting Services Configuration Manager I get the error:

'Report Server WMI Provider error: Invalid namespace'.

I don't know how to get passed this. Can anyone help??

Thanks!